TWACK v. To strike with great force using the back of the middle finger (usually the nail) after coiling it under pressure against the opposing thumb. Accomplished twackers can inflict great welts upon their victim's flesh. (This definition posted by the forerunner was removed from the Urban Dictionary by some evil force... but truth shall prevail!)
That turd cutter pissed me off, so I twacked him right in the munt!
"on the first twack//pope jumped like a macaque//on the second twack//pope was taken aback//on the third twack//lost his marbles the old hack" (A.S. Pushkin)
by Clittary Hilton September 17, 2006
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Originated in Stillwater, Oklahoma in 2000. When you've done too much tweak to the point where you are useless to the world. When you are so spun that you are get caught in the same repetitive motion until you run out of crank.
Damn, Tamara's been working on that crossword book for 3 days straight, someone take her dope away, she's twacked the f&#^ out.
by Ziggity February 22, 2005
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When ample amount of meth is induced into the system and all reality becomes a back seat driver to meth. and no matter what your gonna be late to everything.
jaime must be twacked out because he said he would be here in fifteen minutes. He must have his hands in his fish tank re arranging it ...AGAIN
by jgiddy99 December 4, 2004
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1. Another word for Crystal Methamphetamine.

2. Common objects associated with crystal methamphetamine. These objects can be signs that junkies are present or were there recently (maybe crashed on the floor/couch). These things include really crappy drawings of graffiti on scrap paper, uncleaned dog poo/drinks/food on the carpet, broken light bulbs/missing light bulbs (can be improvised to smoke meth), crafty arts that require short attention spans (for females), left-over traces of meth on the coffee table, and other various tweaker paraphernalia.
1. Yo man you got some of that twack?(twacktonite)

2. Man i got home last night and my room mate had twack all over the living room!
by Smurf October 4, 2006
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Spun,Kreveled,amped,tweaked another term to day that you're all messed up on meth
I smoked all this glass and I was so twacked, I didn't sleep for days
by There February 28, 2004
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A term originating from Huntsville Alabama, Means to have sex or intercourse.
Omg!! Did y’all twack last night?
by Babechill November 12, 2019
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