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To make someone look like a total idiot when they least expect it. It’s like giving them a slap in the face while they’re eating a sandwich.
I told him he’d win the game, then I Gabrah’d him by revealing I was the coach the whole time.
She thought she was the best at math until I Gabrah’d her by solving the problem in my head.
He tried to impress the girl by rapping, but I Gabrah’d him by saying I was the one who taught him that rap.