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1.
A type of anal sex where the breast is inserted into the anus.

Way hotter than ordinary anal.
Guy1: D00D SHE TTLY BUTTBOOBED ME. IT WUZ HAWT!!!11!
Guy2: I JUST CAME! I AM SO BUTTBOOBING WITH MY GF TOMORROW!
by HiHi Kappa Titans August 02, 2008