It rhymes.

The most basic meaning is someone or something with dumb luck.
My dog's name is Lucky Duck because he's lucky I got him out of the pound and he isn't a duck.

A lucky duck was crossing the road and didn't get hit by a car somehow. Asshole.
by MeezNBeez December 17, 2014
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As a guy is receiving fellatio, the person providing it ducks out of the way when he ejaculates.
by corkel February 10, 2011
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a very lucky situation either in the past or presently happening.
Yesterday was so fuck lucky duck. There was a test that I totally forgot I had. I guessed on every one and got an A.
by TWAJW February 5, 2010
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