When a women has become overweight to the point of having a large, sweaty, cheese producing flap or roll of fat hanging down over her puss.
Check out the poon flap on roseanne.
by matt March 28, 2003
2 more definitions
poon meaning pussy and flap meaning....flap
her poon flaps are so big, u could use them for a blanket.
by lisa moon May 07, 2006
just look at your mom's snatch... you'll know...
Oh my fucking christ, your mom has some gnarly poonflaps.
by fat fucking penis March 21, 2003