The flap of fat that hangs over the pant line of an obese person.
That lady has one huge flap-bag.

Check out the flap-bag on that person.

by Drew Butner February 11, 2009
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A woman who enjoys the company of more than one man at a time. May also refer to an ex-girlfriend.
Dave: Guess who I saw in the club the other day?
Mike: Who?
Dave: That cheating flaps bag ex of mine!
Mike: Ohhhhh my days!
by The Big Man AC Slater December 29, 2011
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When a woman suction cups her flaps to a person or object
Oi I heard Emma went around flap bagging the whole house!
by Dramallana February 15, 2017
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Similar to tea-bagging but reverse the genders
Ollie: hey babe flap bag me
Simone: ok! lie down
by SturtImLovinIt February 19, 2021
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