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71.
Crouching down to insert your scrotum into an individuals mouth as a prank while the person is asleep, or on an awakened person, which usually ends with you losing your balls.
Example of Tea-Bagging:
Loner: *Gets killed by a noob*
Loner: "Fuck you, little dipshit faggot!"
Asshole: "Suck my dick!!1" *teabag teabag teabag*
Everybody Else: "Oh come on, that's only for noobs!"
by The Urban Dictionator August 07, 2014