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1.
verb: to use Twitter.com to tell the world about your mundane life; tweet crap; over-using Twitter.
"Dat gal dem's tweeted 'bout her nail extension got mash up in the Waitrose checkout!"

"Cha, she does nuttin' but bare witter, truss."
by 0ad February 15, 2010
 
2.
short for "with her"

also see wittim
last night i fucked witter
by Claus May 15, 2006