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Sexual intercourse between three people, usually hotter when three girls.
After hanging up on a Skype call, a threesum is usually what partakes as a nighttime activity
Threesum by iMindfreak October 30, 2011
Sexual Intercourse involving a male and 2 women.

intercourse involving 2 males and 1 women is a train.
The crowd began to advance upon the Threesum, and Omally was in the vanguard. By then the Threesum was already past its prime.
Threesum by catniporangejuice March 22, 2022

National threesum day 

Day when a girl gets tagged teamed by two males

Squidward Threesome 

A Squidward Threesome is a BDSM threesome involving two disobediant subs, or brats, and a dom. It involves the brats disobeying the dom’s orders, expecting to be punished, while the dom punishes them for mutual sexual pleasure.
I just had the greatest Squidward Threesome, man. I dominated the fuck out of those two girls.

Dallas threesome 

When you have sex in barn, and a grazing cow stands there and watches you.
Liam and I experimented last night, we went out to the barn and had a Dallas threesome.

Third Trimester Threesome 

Having sex with a woman in her third trimester, and thinking the baby touched your dick with its hand and or mouth.
I was railing my pregnant wife when I had to pull out cause I thought I was apart of a Third Trimester Threesome.