used as an insult or threat. especially if you can't think of anything. sometimes is considered STRONG LANGUAGE.
that person who sits next to you: (steals eraser) ha! ha! ha!
you: give that back or i'll.......
that person who sits next to you: or you'll what?
you: quack you!
by PIGGYWISDOM March 15, 2013
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a graphic redneck video of a man shaking his junk and preaching about how he wants to fuck a girl in the but while she quacks like a duck
can you quack like a duck,

no man I'm not watching that video
by ammoratto April 13, 2013
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The retching noise made when having deep throat oral sex.
"Can you quack like a duck?" I asked whilst unzipping my file with an evil gleam in my japs eye...
by Hoverbacon September 21, 2015
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