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To figure out your chances of having sex with your partner or on the first date.
Guy #1: Dude did you nail her.

Guy #2: Not yet I'm still summing
by T.I.T.O May 15, 2009
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3
When one Sings and Humms at the same time! It is quite a pleasant sound a bit like a young walrus' mating call!
I was walking down the street Summing to myself
by Chemshotlord October 13, 2015
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