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Used as an expression to accompany giving someone the finger, telling him or her to literally consume it; therefore, you are in essence symbolically telling the person to suck dick.

This was used to great effect in John Waters' film "Pink Flamingos."
"Eat the bird, bitch!" (from the aforementioned film)

Jim: If this party isn't fun, I'm gonna be pissed.
Tim: Shut up, Jim.
Kim: Yeah, Jim. Eat the bird.
by spike bradley August 08, 2009