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1.
when a guy or girl has a butt that ressembles a perfectly shaped pair of breats.
Dayyuumm girl, did you see the boob butt on that chico? He's lookin' mighty fine
by sbreezyy January 06, 2010
 
2.
When one boob bumps into another person's boob like head butting whether on accident or on purpose.
Wow! You just totally boob butt me!

Oops! I boob butt you again. My bad.
by badlinda November 01, 2011