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(Noun): When two or more members of the same fraternity (usually co-ed) have a steamy sexual encounter.

Adjective form: fratcestual
Girl 1: Ho, I saw you giving our frat bro a frat job at the party last night. Did you two hookup??

Girl 2: Chill, beezie, ain't nothin' wrong with a little fratcest.
by Allpods October 17, 2010
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