Teabagging
Teabagging is an act carried out by a man placing his testicles on another person or object, usually as a prank but sometimes for sexual purposes. The act got its name from its supposed similarity to the action of dipping a teabag. Some call the activity braining, after the appearance of the scrotum.
As a prank, teabagging is inflicted on a sleeping or unconscious victim, and usually involves the man placing his testicles on the victim's face. Photographs are often taken of this pose as a part of the prank in order to further humiliate the victim.
As a sexual practice, teabagging involves a man dipping his testicles into the mouth of his partner as a form of non-penetrative oral sex. Sometimes teabagging is taken to specifically mean the act of a male stripper repeatedly tapping and grinding their testicles into someone's forehead.
Teabagging first entered pop culture in John Waters' cult film Pecker, and the term was more recently seen on the television series Sex and the City. It appeared again the the film Soul Plane included in a list of sexual acts and later defined.