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Someone who comes into your social circle and steals all of your friends. They are generally good looking and incrediblely charming, thus your friends want to hang out with them rather than you. Avoid friendnappers at all costs.
Can also be used as a verb "To Friendnap" which means, to steal one's friends.
"Why don't you hang out with Lauren and Sam anymore?"
"Ever since I introduced them to Joe all they want to do is hang out with him, not me."
"God damn Friendnapper!"
by The President de East August 12, 2011
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