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1.
when a girl wears a really tight shirt but shes fat so the shirt sort of rolls making her stomach look like another set of boobs
man look at that girls belly boobs why cant she just where clothes that fit
by CImm July 13, 2007
 
2.
When someone has a rather large stomach, with an outie belly button, making them appear to have one large belly boob.
Damn, did you see that chick? She had three boobs!

Naw man, that was just her belly boob.
by Dushawn Mandic June 29, 2009