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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.
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 October 31, 2007
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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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3
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 04, 2006
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4
i did 4 geygers and i'm twizzacked
by Jethro May 21, 2003
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5
twack is another word for wack, lame, sum shit tweakers would do
Alicia: lets go to portland

best friend: thats sum twack ass shit
by Cinderlla89 June 10, 2018
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7
The sound a bag of quarters makes when it hits someone upside the head, causing this individual to have a lazy eye.
by Schwank November 03, 2004
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