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IBBT - Itty Bitty Back Titties - Back fat that looks like breasts, often accompanied by a large or small amount of cleavage. IBBT is often found on a larger woman's back and is caused by wearing clothing (tube tops) that are too small.
Husband: Maybe you should reconsider the small bikini top, it gives you IBBT. I'd stick with the extra large.

Wife: Fuck you!
by fishy81 June 24, 2010
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<eXCeSS> hrm, a topic called "i figured out how to make homemade gummy worms"
<eXCeSS> HOLY SHIT HAHAHAAH IBBT
<prozium> Where'd my toothbrush go?
by Andrew February 09, 2005
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