It means sex, used often on radio stations so they don't get fined by the FCC. Other coralarry terms are grenis and grorgasm.
It's crazy how our privates get us in trouble and we all obsess about grex. It's just a grenis and a virginia.
by Leif May 24, 2005
A completely awesome nickname.
I saw the G-Rex the other day...what a stud.
by njcogs December 04, 2010

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