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
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...

quack
by theducksong1234 August 23, 2011
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

1. a fraudulent physician

2. any physician
This quack has no skills in medicine at all.
by Light Joker January 1, 2006
A very sexy sound when moaned by a girl.
guy: so what do ducks say?
girl: ...quack.....
by MallardDuck January 31, 2009
Yo, I need a quack? Yo, you got a quack?
by gotjank June 25, 2007