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Internal sense for locating and protecting oneself from sexual predators, akin to the gaydar for finding gay people.
Mike asked Sue out but she said no and it turns out that Mike date-raped his last girlfriend. Sue has an excellent predar.

Two girls are in a bar- one says to the other, "see that hot guy at the end of the bar staring at us?" Other girl says, "No way- he makes my predar go off! He's a creep."
by dotk October 06, 2010
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