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What guys say when one of their friends is flirting with a girl and she's flirting back. A congratulation of sorts. Usually paired with a nod, high five, or thumbs up. The girl is usually blatantly unaware of the meaning of said exchange.
Guy: *flirts with hot chick*
Hot chick: *flirts back*
Guy's man friends: Wow, nice mack!
by Chick12345678890 May 17, 2009
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