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Define Threesum Meaning

Threesum
Having sexual intercourse with 2 people at the same time

Last night i had a threesum with these to chicks
By Ange
Threesum
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
By Midge
National Threesum Day
Day when a girl gets tagged teamed by two males

National threesum day is the hottest
By Giana