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4.
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.
by BlahhhhhhBiiiittchh! January 14, 2010
 
1.
where 3 ppl, usually either 2 males and a female or 2 females and a male have sex together, lots of diff postions and is quality to do !!
u blow me girl and u the other girl sit on my face
by know it all February 17, 2005
 
2.
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
by freakshow July 01, 2005
 
3.
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
by John OD November 02, 2003