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1.
The act of rubbing one's anus with another person's anus.

Akin to tribbing, except with assholes.
Charles: Hey man, have you seen Willy Wanker and the Trubbing Factory? Or Alice in Trubberland?

Rodney: No, but that sounds hot. What's trubbing?

Charles: Trubbing is when two people rub their buttholes together. Imagine tribbing but with less vagina, and more anus.
by iPoopOnCake March 25, 2010