When your breasts are so big that they literally "bang" against your belly.
Some sluts tend to have big, saggy, bellybangers.
by ...? March 20, 2003
Guy who likes to sleep with pregnant girls.
That dude is a belly banger.
by Dr. Zehas August 25, 2009
The act of not finding the hole on a fat chick and picking a roll to bang instead.
Slick Willy couldn't find her puss so he belly banged her.
by Guru Imakuni February 21, 2003