1. The act of pulling down a beanie-hat hybrid over someones face to where the bill of it is over their mouth, hence the quack.
Bro: dude that nerd is way to nerdy to wear that cool hat.
Bro2: I know dude. Let's quack him.
...
Nerd: Ahh noo. I've been quacked!
by SEV3N November 07, 2011

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queens and jacks
The quacks in the doubleton are useless in this hand
by little_lovely_michael June 13, 2012

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A term used by the supporters of conventional medicine to insult anyone that supports alternative medicine.
Alternative Medicine Supporter: I started oil pulling and using herbal tooth powder. The result is that my teeth are very white and my mouth never felt this good!
Conventional Medicine Supporter: What you're doing was made up by a quack artist! The results that you are seeing are a placebo and the medicine you're using doesn't work.
Alternative Medicine Supporter: How can you tell me that the results I'm seeing are fake? They are clearly real. Let the results speak for themselves! Watch me demonstrate.

(The Alternative Medicine Supporter reveals his teeth and that are so bright white that they stun the Conventional Medicine Supporter!)
by Phantasmagorical Necromancer June 25, 2015

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A Quarter ounce of drugs.
Yo, I need a quack? Yo, you got a quack?
by gotjank June 25, 2007

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Something you yell when a situation is overly cheesy or just plain stupid.
*cheesy,icky-romantic scene in Titanic* Quuuuuaaacckk!! This is the cheesiest bullshit I've ever seen!!!

* A dumb joke being popped in a stupid movie* Quack! That is so gay and not even funny.
by Quack quack! April 20, 2010

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A code word for quarter, as in a quarter ounce of smoke/weed.
"How much does a quack run?"

"Can you do a quack?"
by Laura Hill August 14, 2007

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A squeaky little kid (ages 4-14) that rage on games such as COD
I'll fuck your mum
1 vs 1 me bro
Bring it I'll fuckin rek u
Is that your mum in the background? Calm down Quack
by Pakifromthecornershop February 27, 2015

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