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1. Suck a duck
Verb: Exclamation of angst, dismay, and/or frustration. Does NOT involve actual poultry.
"Mom! James just flushed your keys down the toliet!"

"Oh, SUCK A DUCK!"
2. suck a duck
something that is just plain stupid
The fact that OS X has copy and paste, but not cut, really sucks a duck
3. suck a duck
you say it to someone to tell them to go suck a ducks ass
why dont you go suck a duck