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1.
When a group of three people join together for sexual pleasure.
My best friend asked me to join she and her husband for a threesome.
by Belinda November 05, 2004
 
2.
Three people having sex together. One person may be in the middle, or everyone can have sex with everyone else. A threesome can take several forms:
(1) FFF
(2) MMM
(3) MMF
(4) MFF
but some level of kinkiness is inevitable.
by OrangUtanUK June 18, 2003
 
3.
1.) a group of three people
2.) a sexual act performed by three people together
3.) a triumvirate, i.e. three people ruling a country or company together
1.) Larry, Harry and Mo were a famous threesome.
2.) "Hey, Tiffany, how about you and me and Delicia go over to my place for a threesome?"
3.) Now that Berrington has taken over the regional management, I think we're soon going to see an end to the Wallace-Kingwill-Mason threesome.
by Xaviana December 01, 2003
 
4.
The best way to fuck other women on the side without ending up in divorce court or in the wraths of a pissed off girlfriend. This can broaden the sexual horizons for any couple by providing the male with the opportunity to get some new pussy occasionally and helps the woman live out her secret, curious masterbation fantasy.
That dude is lucky. He had a big threesome last night. His girlfriend's co-worker rode his cock while his girlfriend sat on his face and rode it like the Kentucky Derby.
by Stifler74 December 28, 2006
 
5.
When three people have sex. This can be two males and a female, two females and a male, three females or three males.
Cathrine screamed in happiness as she cracked into an orgasm, after Jack had cummed inside of her. Suddenly, the doorbell rang. Cathrine tried to get off the sofa in the living room to get it, but Jack didn't want to waste all the hard work he had done to get her into so much pleasure. After a good five-minute orgasm, they made their way to the door, with Cathrine still riding Jack. At the door was a beautiful blond woman called Jemmie. She stared seductively at the couple. Jack took his dick out of Cathrine's fuzzy vagina, but noticed that she was completely ignoring him. Jemmie leaped towards Cathrine, and they started making out. Jack decided to help by undressing Jemmie, caressing her giant breasts and hairless pussy. Once Jemmie was naked, they started to grind against eachother. Because they were so wet, strips of their juices were streaked across their thighs. The clapping of their pussies made them even wetter. Jack started to feel left out, so he parted the ladies and began to eat out Jemmie, while Cathrine gave him a blowjob. Suddenly, he couldn't hold it in any longer. He needed to have some of Jemmie's pussy. He shoved his dick in her vagina, while the two girls made out. he licked and caressed her breasts and nipples, nibbling them. he fingered Cathrine at the same time, which made them all have and orgasm at the same time. They fell asleep spooning, wet and shaking with happiness, then repeated in the early hours of the morning. It was the best threesome ever.
by Randomerr10111 May 19, 2011
 
6.
A threesome is the term which describes a sexual act involving three people, sometimes also referred to as a menage a trois.
A true threesome is when all three people have sex with each other, not when two people just have sex with one person and not each other.
by OneBadAsp October 17, 2006
 
7.
The act of three people having sex simultaneously.

A fantasy for most men because it is NEVER going to happen.

If it did,they probably would be left out because the two girls would forget he was there.
Forget the threesome. It is the male equivolent of Big Foot.

You have heard about it, seen madeup footage of it, but it does not exist in the real world.
by Cheerleader Fucker August 25, 2004