Tweek Tweak

Tweek, voiced by Matt Stone was introduced near the end of season 2, he is a noticeably jittery boy.

Name Origin
The name Tweek comes from the term 'tweeker'. Tweekers are people who recreationally use crystal methamphetamines. Tweek's first name is unknown, everyone calls him by his last name.

Apperance
Tweek has blond hair that looks as if he just rolled out of bed, wears a gray shirt buttoned wrong, and gray pants.

Jitters
Tweek's jitters are caused by caffeine, due to excessive coffee consumption, because his parents own a coffee shop and continually give him cups of coffee. According to Tweek's oblivious mother, he has ADD, which he tries to control with transcendental meditation.

Friends
He was chosen as the fourth friend after Kyle,  Stan, and  Cartman kicked  Butters out of the group.

Facts

 * In episode #217, Gnomes, their coffee shop almost went out of business because 'Harbucks', a parody of the Starbucks coffee shop chain, opens a shop in South Park.
 * Whenever Tweek is told to do something, he responds by saying, "Aaagh! Way too much pressure!" Tweek seemed to practice fatalism in episode 511 (Osama bin Laden Has Farty Pants)
 * Tweek fought with Craig in episode #304, Tweek vs. Craig.