Teabagging
Teabagging can have various meanings.
Teabagging as a prank
As a prank, teabagging can refer to the repeated dunking of a person restrained inside a bag into water. This is a common boys' boarding school prank. It should be noted that this predates any known usage of the term below.
Teabagging can also refer to a man placing his testicles on another person or object as a practical joke. This is sometimes known as braining, after the appearance of the scrotum. 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.
Teabagging as a sexual practice
As a sexual practice, "teabagging" refers to a man dipping his testicles into the mouth of his partner as a form of 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 (as an act banned in a particular male strip club) and the term was more recently seen on the television series Sex and the City. It appeared again in the film Soul Plane included in a list of sexual acts and later defined. It also appears in America: The Book by the staff of The Daily Show and has been referenced on the television show by its host, Jon Stewart.
Teabagging in Halo: Combat Evolved
Teabagging made a recent show in the popular Xbox first-person shooter Halo: Combat Evolved. It is likely that it orignated in other multiplayer shooters, but has seen increased popularity on Xbox Live, where players will add insult to the injury of their defeated foes. A player will stand over the head of a corpse and crouch repeatedly, simulating "teabagging" as described above, occasionally commenting over an Xbox Communicator Headset. This, however, is a brash move, exposing you to easy attack, increasing the risk and insult if you finish unharmed. Internet comic site VG Cats created a strip depicting the act.