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One (usually a male in their teens or early twenties) who reads into the character of their romantic or sexual target (by general stereotyping), in order to find the most effective way with which to attract them.

An alternative definition: A guy who "gets it on" with more than one chick at a time, and would not make a respectable bf.
He is so <i>tuning</i> her. --> "He is such a <i>tunedog</i>."
by Clarla March 28, 2008