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.
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As a guy is receiving fellatio, the person providing it ducks out of the way when he ejaculates.
Damn girl! That's a lucky duck.
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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.
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