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Slang term used to describe spoiled, arrogant, closed minded but experimental, often hipster or scenester/goth youth. These kids usually come from money, have working parents, live in condos downtown with their families or live north of the city.
Guy: I met this chick at a Ryerson party last weekend. She was pretty hot, we got along nice. She's a local too which is sick. But she talks out her ass.

Friend: dude she's a GTA-brat that's why.
by ingenueyou July 27, 2011