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1.
Internet slang for a pre-operative transsexual (pre-op tranny). The term is in wide use on many web boards, most notably arfcom (ar.15.com).
Chris: "Hey Bob, did you hear Gary's really a markm."

BOB: "My god, no, I had no idea he was a really a pre-op tranny."
by Willy B. Hung October 07, 2006