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1.
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

Words related to Bird Flap

bunt crotch belly dickie doo fatso muffin top
 
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