Really weird or bad. Usually something unexpected and or looked down upon.
Mia: I can’t believe that Markus broke up with me!
Rachel: wow, that’s wack!!
by cordeliaaa!! September 16, 2023
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A wack is a quantity of a group of things numbering 50 most often used by black smiths.
I need 4 wacks of those tong halves finished before you leave tonight.
by groubn May 31, 2020
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To inject a drug.
I need to have my wack first before I go out
by Babyj78 August 14, 2022
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is so cool

is awesome

is wack cool

Crazy cool
Those colorful shoes are wack awesome!
by K8t bel November 17, 2019
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Being lame, cheap, stingy and acting fobby.

Arguing over logic with fallacy and illogical arguments.
Samtik: Adhnan, you owe me money for staging your house
Adhnan: I ain't paying. You didn't sell the house. Go Fuck yourself.
Samtik: Adhnan, you are wack bro.
by aamir rnb October 25, 2018
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you put $5 worth of pennies in a sock and wack someone until the sock explodes
hey i gave that guy down the road the penny wack
by mr georgy the handgun September 27, 2023
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