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 5, 2004
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What ducks should be saying, instead of "Got any grapes?"
Then he waddled away (waddle waddle) then he waddled away (waddle waddle waddle) til the very next day...

by theducksong1234 August 23, 2011
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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 18, 2003
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1. a fraudulent physician

2. any physician
This quack has no skills in medicine at all.
by Light Joker January 1, 2006
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A word used instead of the word wack. Typically used inside restrictive schools, where many such words are banned.

Alternatively, it's used as an exclamation or substitute for an expletive, such as fuck, in any and all situations.
That assignment Mrs. Ratman gave us is so fricking quack. It's too hard!

That quacking hurt, Jerry! Why the QUACK would you quacking throw that thing at me?
by yeetthegeese April 11, 2019
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A very sexy sound when moaned by a girl.
guy: so what do ducks say?
girl: ...quack.....
by MallardDuck January 31, 2009
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