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Someone who Twitters obsessively on the social networking site "Twitter." Twitter + Geek = Tweek. Often appearing to be normal people on the surface, they will quickly reveal their inner geek whenever anyone mentions Twitter in a conversation, at which point they will tell everyone within earshot about all the hilarious and uninteresting things their friends and acquaintances have recently tweeted about.

See also "Twatter", someone who tries to accumulate a large following on Twitter in order to hide the fact that they are actually a giant twat.
Rational human: "I can't believe CNN is reporting on what politicians are tweeting from the halls of the Senate...or that politicians are tweeting in the halls of the senate, for that matter."

Tweek: "OMG I LOOOOOVE TWITTER!!! My friend Jessica just tweeted about how the guy next to her in line at the DMV just farted and she said it smells like a mix of hot garbage and a yeast infection!!! How funny is that?!"

Rational Human: "I hate your face."
Tweek by thepoolboy October 6, 2009
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Similar to a Gleek, the Tweek is the Twilight version. Geek + Twilight = Tweek
OMG I am sooo excited to go and see the new Twilight movie, I'm such a Tweek!!
Tweek by Sazilicious July 7, 2010
Related Words
to send a tweet in Greek
Hey did you see Matt's tweek? What did it mean?

Yeah, he told Amy how awesome the flaming cheese was in Greek... I google translated it.
tweek by greektweeker February 21, 2011
When you can't twerk, so you have to push your buttcheeks up and down to make them look like they are bouncing.
Guy1: Is that girl twerking or what?
Guy2: Naw man she's tweeking...
Tweek by Uhhhhhh123 February 8, 2014
"Dude, check out my tweeked up motorcycle..."
tweek by kevsgrl2004 June 9, 2003
When a girl plays with her Vag for pleasure or to tease men
My hoe girl friend was caught tweekin off at a party, all the guy seen her cookie
Tweek by Savoyo September 28, 2008
Can be a state of paranoia, Have to urge to hurt or kill somebody, Be Extremely mad (sometimes because of drugs or mental ilnesses)
Tweek by Mike AKA TweeK December 14, 2008