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A person you may or may not have previously known, whom you suddenly stumble upon a mutual attraction or flirtation with and decide you would like to keep around a while.
girl 1: So have you hooked up with Jeff yet?
girl 2: No, but he's definitely a lucky penny. I can't jump into that just yet.
by littlewanton September 13, 2011
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To knee someone in the you-know-what. Used when someone is really mad at someone else.
Hey today my friend was being a real jerk so, I did a Lucky Penny on him.
by Jrayden March 24, 2011
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