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2.
if a man wants to fuck a woman he could use this expression. it implies he has a large enough cock and a hard enough boner he could "rub her belly from the inside" when he fucked her.
hey babe, wanna a belly rub
by dirty.diana June 27, 2009
 
1.
When your dog lays down on his back and sticks his belly out for you to rub! Gotta love it, it's so cute! :)
I luv my wittle Murphy!
by Innocent Girl January 03, 2005