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Mainly said by females and is the more polite term for a fuck buddy or a friend with benefits, useful for when in company where you cannot describe the person as a fuck buddy but need to make sure that everyone is aware that you're not going out with him.
Girl 1: "So what's with you and Tom?"

Girl 2: "Nothing he's just a male acquaintance."

Girl 1: "So you're sleeping with him?"

Girl 2: "Yeah pretty much."
by phallic cranium November 13, 2013
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