Top Definition
A combination of the words "Greek" and "incest". Occurs when a member of a fraternity or sorority hooks up with a member of their Greek family. Major taboo in the Greek community, but it happens.
I heard that Jake the Phi Sig walked his A Phi little home from the party last night and never left. Greekcest much.
by NotASorostitute May 17, 2010

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