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1.
A behavior in which a person decides to withdraw almost entirely from the friend circle they belong to and not hang out with anyone for a long time or possibly forever.

Similar to tubing, except instead of sitting on a river with friends, you just fall off the face of the Earth and never speak to your friends again.
Rachel used to be our friend, but she's been trubing for the last six months and none of us have been able to meet up with her.
by Eyedropz October 02, 2012