When British singer Charli XCX released her sixth album, the hyperpop Brat, fans declared it to be a “brat summer,” indulging in lime green (the eye-catching color of the album art) and dancing through emotional crises to catchy club music.But the term reached a new stratosphere when Charli XCX posted “kamala IS brat” on social media platform X shortly after President Joe Biden endorsed Kamala Harris for the Democratic presidential nomination. Harris’s campaign page even changed its header image on X to reference the album cover.But brat summer is much more than presidential preferences, and being a brat isn’t about tantrums and toddlers. “You’re just, like, that girl who is a little messy, and likes to party, and maybe says some dumb things sometimes—who feels…