1 definition by Clubclem
The proper term for sexual intercourse between ten people; most commonly used to refer to a man and nine women.
Man #1: Dude, you know that girl that's got six sisters right?
Man #2: Yeah, why?
Man #1: I had a decum with her, her sisters, and her mom last night.
Man #2: But that's only nine people.
Man #1: Oh, and her cousin.
Man #2: Yeah, why?
Man #1: I had a decum with her, her sisters, and her mom last night.
Man #2: But that's only nine people.
Man #1: Oh, and her cousin.
by Clubclem May 5, 2013