Top Definition
bumping into someone from the behind using your chest with your arms and legs spread out.
Kid 1: Why did you get written up today?

Kid 2: Oh, I fatbird'd a kid and he fell.

Kid 1: damnn


Kid 1: I saw him fatbirding someone.

Kid 2: LOL who was the kid?
by Nightmare34434 January 13, 2012

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