She defined “brat” as an “attitude” or a “vibe” before using the term to discuss “Martha,” a documentary film about Martha Stewart that premiered on Netflix late last month. “When Martha gets mad about an old magazine article and she says that she’s glad the journalist who wrote it is dead, that is brat,” said Charli of the home decor guru.

So many people have asked me, ‘What is brat?’ And honestly, it’s just like, an attitude. It’s a vibe,” the singer said during the comedy sketch show.

Charli XCX should be the perfect pop-niche mix for Saturday Night Live—and maybe she is? Increasingly, it’s difficult to parse what counts as a zeitgeisty pop-culture joke perfect for the most mainstream sketch-variety show on TV,

So, you survived "Brat summer" but you still don't even know what "Brat" even means. Are you hopeless? Fear not — Charli XCX is to the rescue. The perpetually cool pop star pulled double duty on last night's SNL,