Brat Summer was both a mindset and an aesthetic. At its core, it meant embracing mess, chaos, and imperfection as a deliberate rejection of the polished "clean girl" trend that dominated TikTok in 20231. The look was intentionally low-effort: smudged makeup, no bra, cigarettes, a Bic lighter, and a strappy white top4. The album's cover art, a plain lime green square (#8ACF00) with the word "brat" in blurry, low-resolution Arial font, became the visual shorthand for the entire movement8.

The trend's appeal was rooted in what music sociologist Julian Schaap and media researcher Simone Driessen described as a response to existential anxiety among young people6. Rather than wellness culture's emphasis on optimization and self-improvement, Brat Summer said: party through the uncertainty. As Charli XCX put it, being brat can be "quite luxury" but also "trashy... like a pack of cigs and a Bic lighter and like a strappy white top with no bra"4.

Brat Summer broke out of internet culture into mainstream media, politics, and language. The Guardian, NPR, The Verge, and BBC all published feature-length pieces analyzing the trend1910. Fashion houses and retailers competed to release "green edits" matching the album's color1.

The political crossover was unprecedented for a pop music meme. The Harris presidential campaign's adoption of Brat aesthetics was covered as a genuine campaign strategy, not just an internet joke9. Emma Mont of Organizer Memes told journalists that "the acknowledgment of 'Brat Summer' and something that is so popular in youth culture is going to re-excite people who felt like they were being left out of the conversation"7.

Collins Dictionary naming "brat" its 2024 Word of the Year put an institutional stamp on the trend's reach5. WGSN, the trend forecasting firm, published analysis connecting Brat to broader shifts in youth culture away from "clean girl" aesthetics and toward anti-perfectionism3.

The trend also reflected broader fashion and music cycles. WGSN linked the Brat aesthetic to the resurgence of Indie Sleaze and early 2010s club kid styling3. Observers noted the pattern of recession-era party music, comparing Brat to the Kesha and Pitbull era of 2008-20101.

The ground for Brat Summer was prepared by several years of TikTok trends that pushed back against performative wellness. In 2023, "Rat Girl Summer" encouraged living like a rat: low-effort, unbothered, feral1. Before that, Megan Thee Stallion's "Hot Girl Summer" in 2019 was about confidence and self-love1. Brat Summer took a different angle. As novelist Sheena Patel put it, "Charli xcx feels like a Dionysian agent for being more unhinged"1.

The album's marketing was unusually clever. In the weeks before release, a wall in Greenpoint, Brooklyn (dubbed the "brat wall" by fans) was painted and repainted with the album's green color and rotating messages tied to the promotional cycle5. Charli XCX's record-breaking Boiler Room show drew over 40,000 RSVPs, and the album sold 45,000 copies across 14 different vinyl variants3. The Brat Generator website let fans type anything over the green background in blurry text, turning the album art into a participatory meme format. From "anxiety" to "debt" to political slogans, the green square became a canvas8.

The trend hit a specific nerve with millennials and Gen Z women. Canadian author Monica Heisey described the album's message as "feminine contradiction," the tension between being a nonstop party girl and worrying about parenthood, between feeling empowered by friendships and feeling anxious about them1. The Verge's breakdown noted that Brat Summer included but was not limited to: cigarettes and no bra, bed rotting, annoying your boyfriend, not working, and alternating between crisis and unadulterated joy9.

Researchers at Erasmus University Rotterdam provided academic context. Simone Driessen explained that participants in the trend were partly motivated by fear: "We know the end of the world is coming, so: party like there's no tomorrow, only to protest again the next day"6. Julian Schaap called it less hedonistic than escapist, even healing, noting that at a time of rising mental health crises among young people, an artist who could get people out of their homes to party "is worth something"6.

The Kamala Harris crossover in late July was the trend's peak visibility moment. TikTok creator Ryan Long had been making edits of Harris set to Brat music before the endorsement. He scoured the internet for Harris' most meme-worthy moments, like proclaiming "I love Venn diagrams" and singing "Wheels on the Bus" off-key, then set them to the album track "Von Dutch"7. The resulting edit racked up over 40 million views across platforms7. "If Kamala Harris becomes president it's bc of this edit," one person tweeted7.

The Harris campaign walked a deliberate line. The "Kamala HQ" X account's bio was changed to "Providing context," a nod to Harris' coconut tree speech that had already been a meme for over a year9. BBC reported that the campaign's adoption of Brat aesthetics helped Harris connect with younger voters "who now, thanks in part to Charli XCX, see her as the 'cool girl' option"5. UW-Madison professor Michael Wagner cautioned against overstating the memes' electoral impact but acknowledged their power to drive attention: "We have two candidates who use social media well, but in different ways: Trump uses it to get attention. Harris uses it to shape attitudes"7.

By mid-August, a counter-trend called "Demure Fall" started gaining traction on TikTok. Where Brat embraced chaos, Demure promoted quiet confidence, calmness, and not drawing attention to yourself10. USA Today's Charles Trepany told NPR that both trends were different coping mechanisms for the same underlying cultural anxiety: "Brat is embracing it fully, embracing the mess, embracing the wildness. And then demure, in a way, it's like a more calming way of moving through life"10.

Charli XCX declared Brat Summer "over" in September 20245. But in November, Collins Dictionary named "brat" its 2024 Word of the Year, defining it as "a confident, independent, and hedonistic attitude"5. The dictionary called it "fitting" for a year where "hedonism and anxiety have combined to form an intoxicating brew"5.

The trend saw a brief resurgence at the 2025 Coachella Valley Music and Arts Festival, where Charli XCX performed with guest appearances by Troye Sivan, Lorde, and Billie Eilish. Onstage text reading "PLEASE DON'T LET IT BE OVER" suggested even its creator wasn't quite ready to let go5.