Butt - Boobie 

When you have a fat pimple on either one of your butt cheeks. This pimple makes your butt cheek/cheeks look like a boob. The cheek of the butt is the breast, while the red pimple is the sexy nipple!

Oh my gosh! You have such a sexy butt - boobie. Can I get your number?

Butt - Boobie by Butt Sav January 7, 2011

Buttboobing 

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!

Buttboobing by HiHi Kappa Titans September 26, 2008