Top Definition
When more than 2 people engage in sexual activity, this can include straight, lesbian, and gay groups. Also, abbreviated as "GS"

Alice: Where were you last night?
Tom: At Jay's party.
Alice: You were out pretty late...what did you do there?
Tom: Just a bit of group sex, there were like 20 people there!!!
by JoTheRenthead August 12, 2006

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