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Incest occurring within a Greek family in sororities or fraternities. Common Greek incest occur as drunk make outs between your pledge mom's boyfriend's pledge son or anything along the lines of being in the same pledge family.
Frat guy 1: Dude, that Sigdelt is totally hot. I made out with her!
Frat guy 2: Isn't she your pledge dad's girlfriend's kid?
Frat guy 1: Yeah. So? She's not my real sister.
Frat guy 2: That's you're pledge sister! Greek incest!
by TokenAsian December 23, 2011