noun. A keen, small-mammal-detecting sense.
Related terms: gaydar, straightdar, bi-dar, hickdar, loserdar, boob-dar, penis-dar, big dick-dar, hair-dar, porn-dar, sex-dar, food-dar, sleep-dar, money-dar, ho-dar, slut-dar, babe-dar, virgin-dar, jailbaitdar, hottie-dar, weirdo-dar, jerk-dar, moron-dar, dorkdar, skankdar, freak-dar, ass-dar, asshole-dar, Pretentious Club-going New York Assholedar, "someone is staring at my ass"-dar, sexual-geniusdar, “Jesus Freak” dar, zombie-dar.
Real citation: "Just out of ear shot, though, Larry said that the red headed guy was a hooker. I looked back and wondered how Larry could determine such a thing, as he seemed to be just a guy standing on the sidewalk to me. Yet, for some things Larry has a keen eye: I've got gaydar (of which he has none), and he's got toupeedar and hookerdar (of which I have none)."
(Jan 15, 2002, Justin's Life, http://www.justinslife.com/00jan.html)
Made-up citation: "I don't have good toupeedar. Remembering to use gel uses up all of my hair-related intelligence."