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A person (usually a man) who counts all of the girls (or guys, if a woman) he is able to get with in a certain period of time. It could be within his entire life time or it could even be within a week.
Person A: In the past month I've hooked up with six girls and I've had sex with two of them.

Person B: Man, you're a number runner.
by Number Runner December 25, 2009
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