Top definition
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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Jul 25 Word of the Day
A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy
My bf and I used to really get it on together, but now it's just the occasional cumpadre wank
by Gladys Pipps-Knightley May 14, 2007
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2
Sport or recreation
Bob: "Do you like summing?"
Jake: "Ya, I play baseball all the time"
by Isabellathefirst January 13, 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 August 31, 2015
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