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52.
To claim possession of something for when you return, such as a seat. Short hand for the phrase "quack quack I get my seat back"

Counter arguments include:
1. Move your feet, lose your seat
2. Cluck, cluck, I don't give a fuck!
Abby gets up from the couch and says, "Quack!"
Abby has 'quacked' her seat, thus no one else can take it.
by Savannah Cheyenne February 18, 2008
13 32
 
1.
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 December 04, 2004
490 105
 
2.
The sound a duck makes
"Quack"
by Lindsay February 25, 2003
412 129
 
3.

1. a fraudulent physician

2. any physician
This quack has no skills in medicine at all.
by Light Joker December 31, 2005
184 112
 
4.
A very sexy sound when moaned by a girl.
guy: so what do ducks say?
girl: ...quack.....
by MallardDuck January 31, 2009
144 107
 
5.
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!
by thats whack February 22, 2009
88 64
 
6.
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 February 17, 2003
94 71
 
7.
-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.
by DaQuackyPaki December 06, 2009
37 24