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20. Quack
Quacking in the manner of a mallard is what one should do when faced with any ridiculous and unneccessary comment from any idiot in any social situation. It is commonly used by me as a term of derision and contempt.
Idiot: Wow! Did anyone catch that episode of Dawsons last night. It was totally cool!

Me: Quack.
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1. quack
A doctor of questionable ablitiy and reputation.
Even tho Erin's dad claims to be a doctor, I say he's a quack! He didn't even graduate high school!
by Stella Lafayette Dec 4, 2004 add a video
2. quack
The sound a duck makes
"Quack"
by Lindsay Feb 25, 2003 add a video
3. quack

1. a fraudulent physician

2. any physician
This quack has no skills in medicine at all.
4. quack
A very sexy sound when moaned by a girl.
guy: so what do ducks say?
girl: ...quack.....
5. Quack
noun: slang for "crazy" common in the south, especially near areas of high duck concentration.

1. That's quack, man.

2. You're so quack.

3. Dude! that's quack, yo!
6. quack
A scam-artist. A person who makes up bullshit medical products or advice or prescriptions that don't work. A snake oil salesman.
Most alternative medicine "specialists" and psychics are quacks.
by anonymous Feb 17, 2003 add a video
7. Quack
-To quack is to perform an act that displays one's stupidity, incoherence, lack of coordination, or outright inability to relate or adapt in a social setting. Derived from the sound a duck makes, more specifically the verb form for what a duck (see definitions 5,8, and 9 for "duck") does.
-To fuck up the situation for everybody.
You missed the biggest quack!
What happened?
____ ran down the hill, tripped and busted ass all over the sidewalk and fence by the tennis courts!

How was your birthday?
Fun as shit, we got fucked up then ______ quacked ridiculously by hitting the blunt BACKWARDS! He didn't even notice for like 2 seconds, then he got up and slid down the hill and lost his keys.
What a fuckin' quack

I dropped the entire pizza on the ground.
You're so quackin.
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