Top definition
Fat guy's belly below his belt (similar to Bunt or Crotch Belly)
That dude's belt is pushing down his bird flap
by Joe Carott December 22, 2008
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2
A dance typically conducted while pre-gaming before the bar.
"I feel like tonight's gona be a great night downtown, Ryan is already drunk and doing the bird flap!"
by MadPlayRK July 06, 2014
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