Teabagging is a slang term for the sexual act involving placing the scrotum into the mouth of a sexual partner for sexual pleasure, or onto the face or head of another person, sometimes as a comedic device.
The name of the practice, when it is done in a repeated in-and-out motion, is derived from its passing resemblance to the dipping of a tea bag into a cup of hot water as a method of brewing tea. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay.