Top Definition
(noun): A rather large portion of fat extruding from a person's (man or woman) shirt, so much the belly is sticking out of the shirt he/she is wearing. The inverse of cleavage.
Eww she is showing some serious underbelly cleavage. Turn away!
by UNknownINformant May 22, 2009
5 Words related to underbelly cleavage

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