Quack is a word that can mean many things. It is the sound a duck makes, it can be an insult, & it can be a punch line.
Duck: quack
Angry human: what a quack!
Funny human: your just quacking me up!
by NoodleQuack February 18, 2018
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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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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!)
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1) you just got screwed, or something really bad just happened
2) you just got massively shut down/disgraced
3) you're whipped and your girlfriend's pulling your chain
holy shit, you just got quacked, G.
by qmacks September 24, 2003
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