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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)
twack by Clittary Hilton November 19, 2007
Related Words
Someone who is in the gray area between a crackhead and retard.
You're a fucking twack.
Stop twackin out
Twack by TheCreatorUBitch January 26, 2019

Twackerjack 

A sleep deprivated person that is spun out on meth.
Twackerjacks are easily detected by their severe body and facial contortions (see: Monkeyface).
Damn girl! You are completely twackerjacked. Go to bed.
Twackerjack by lledrovc July 25, 2007
a meth user who is really proud of him or herself and thinks no one can tell they're high and acts animated. they know everything.
"You better let squeek fix the lawnmower or he'll go twackstar on you."
twackstar by Crys Crystopherson January 31, 2009

twack-a-lackin 

1) To ask someone in a nonchalant manner if they have some shit(meth) for sale.(verb)
2) To tweak on something.(verb)
3) Refering to the state of mind after consuming a substantial amount of high quality METH.(adj)
1)"Oy ya fuckin tweaka are you twack-a-lacking?"

2)I was twack-a-lackin on that earlier.

3)"Damn daw' ya pupils are fuckin huge! Are you twack-a-lacking?"
twack-a-lackin by P.T Kt Bec October 15, 2006

Double Twacker Half 

A 30-pack of beer:

Twacker = 12
Double Twacker = 24
Half Twacker (Half) = 6

Double Twacker Half = 30
I picked up a double twacker half from the beer distributor.
Double Twacker Half by Pakalypse January 22, 2011