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1.
Endless Twitter stream of self-gratifying, self-promoting, self-congratulatory crap unoriginally composed in 140 characters or less.

v. Twitturbate
n. Twitturbation
adj. Twitturbatory
adv. Twitturbatingly

(Not to be confused with Twitterbate, achingly boring Twitter debates that really ought to be taken to direct message.)
"I logged onto Twitter today and @XXX was having another Twitturbate session with himself."

"This convo is nothing but Twitturbation. Why don't u get a life?"
by Viva Visibility September 18, 2008