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1.
A term used in adult classified advertisements which describe a type of sexual act that the author is not aversely looked upon.

More specifically, the classified advertisement is typically a tacit solicitation for sex, listing the looks of the solicitor, age, price, and other items of miscellany. The term Greek OK means that the particular solicitor is willing to engage in sodomy; specifically anal sex.

Also common: Greek not OK
Melinda, 20, sexy blonde with long legs, $60 - Greek OK
by Evan_12345 January 10, 2006