Top Definition
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 10, 2009
A skanky minga, found in western Sydney.
Yo Bruce, check out that flap bag on the corner.
by Steven R27 August 30, 2008
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