noun. An ability--who knows, perhaps bestowed by the one true God--to detect asshats of all persuasions and denominations.
Related terms: gaydar, straightdar, bi-dar, sexual-geniusdar, 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, “Jesus Freak” dar, zombie-dar, fake-boob-dar, dogdar, catdar, ratdar, camel toe-dar.
Real citation: “other then that, just use your ASSHATDAR (asshat radar that is!)”
(April 11, 2007, http://www.xceedspeed.com/forums/showthread.php?p=1165236)
Made-up citation: "Enclosed is my resume, which details my graduate education, managerial experience, quick reflexes, keen asshatdar, and nice gams."