The bulge in a person's (usually a woman's) abdomen when a hand that may occur durring anal fisting if the fisting hand penetrates the person deep enough and if the fister pushes outward against the inside of the abdomen with the fisting hand.

If you're into hardcore porn you might find this hot.
I fisted that bitch so deep that I gave her some nice belly bulge.
by Crazy_anal_shit February 13, 2017
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(noun) the curve of a woman's belly from just below her navel to just above her pubic hair
Nancii has a very attractive belly bulge, I get a boner as soon as I see her pull her pants down 3"
by Jake January 13, 2004
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