To put a liquid of any sort into the bellybutton of the victim, and having them suck it out. Most commonly a straw.
by TheDukeKris January 11, 2010
by WHAT?! June 21, 2005
An alternitave way of spelling "Butt Sex". Often read aloud by an unsuspecting member of the public, who will then realise what they have said.
by tits_mcgee March 01, 2008