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When someone is a little bit more than mischievous.

Commonly mispronounced as "promiscuous".
Person A - That's so misguyvious!
Person B - Not as misguyvious as that girl to my left.
Person A - Ah, yes, she is a little bit more than just irresponsibly playful.
by Rawr Ga Rawr Rawr Rawr April 24, 2009
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