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Engaging in sex acts with two other people; either MMF or FFM. Usually used in text speak.
Wanna 3sum 2nite?

Most peopl fantasise about 3sums
3sum by freakshow July 14, 2005
When two people have sex, And the third person video records it.
Bob: Yeah, I had a 3sum last night!
Tom: Was it good?
Bob: The third person, Was such a good recorder, It could have been a porno!
Tom: When you make it A movie, I'm buying it.
3sum by BlahhhhhhBiiiittchh! January 14, 2010
3 HOT HORNY SLEAZY GUYS ALL FUCKN EACH OTHER ALL THE WEEKEND LONG
Lets have a good hot 3sum and get wired
3sum by MR J PIG September 27, 2019
When three Fuck hopfuly when the guy gets 2 gurlz at once like me all the time
John gets his cock sucked by traci while eating out shawna all that time
3 sum by John OD November 2, 2003

landen and brenden having 3 sum 

When you find a girl and start having a 3 sum with her then you randomly stop nad start sucking each others dick
Dude last night I had the best landen and brenden having 3 sum. It was so much fun
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.

Man, I just watched the funniest nutshot video ever.
Nutshot by Uberflaven March 1, 2009
Word of the Day on June 26, 2026