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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
Let’s 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
More from Urban Dictionary
The number of years you are still sexually active
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
sexspan by Dr Kat April 21, 2022
Word of the Day on October 28, 2026
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.
You didn't get any napkins with your takeout pork fried rice? Womp womp.
womp by 175623226 November 3, 2011
Word of the Day on October 27, 2026
When your wife’s boyfriend let you sleep past 8pm 😎😎
Wife’s boyfriend: You have 5 more minutes
Me: Poggers!
Poggers by Just_Charles April 14, 2020
Word of the Day on October 26, 2026
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