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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!
IBBT by fishy81 June 27, 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?
ibbt by Andrew February 9, 2005
Related Words
Short for Illegal Brick-Building Techniques
A connection method not approved by official designers because it stresses pieces beyond their physical design limits, causes permanent deformation, or relies on loose, unsupported friction
Me. SH*T! I Didn’t Know That Was Illegal. I Am So F****d!
L.C.P.D Officer: HANDS UP! YOU ARE UNDER ARREST FOR DOING IBBT! GET IN THE POLICE CAR NOW!
IBBT by EF2020 July 24, 2026
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