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.
by greektweeker January 31, 2011
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!!
by Sazilicious July 02, 2010
A character from the T.V show "South Park". He has very messy blonde hair and supposedly sufferes from A.D.D but his twitching and nervous personality is due to the large amounts of caffeine he consumes. In Series 6, Tweek became the main characters replacement for Kenny, alongside Butters, after he "permeanantly" died at the end of the previous series.
"Tweek's the worst character ever."
"Yeah. Worse than Towelie."
by Issy Aidsfunop January 15, 2006
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."
by thepoolboy October 05, 2009
The biggest fag within a group of friends, generally shaky and uncomfortable.
God, josh, what a tweek.
by Jack Daniel Smirnoff March 24, 2011
to be overly excited at a situation or event that is highly positive and causes exuberance beyond classification of excitement.
Scott won a vacation to Hawaii, a place he always wanted to go, causing him to call his friends and tweek.
by BT14 July 29, 2007
Someone who gets around
Alvin is a tweek, all he does is tweek with all the boys in the class
by BigPappa12345 September 12, 2011

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