noun. A honed skill, razor-sharp, that leads one's nose to groiny nether-regions and wonderlands.
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, asshat-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: “lol Scorp I know exactly what you mean..i call it crotchdar. Even if i don't wanna see it, if its there and its obvious i will look.”
(May 8, 2007, http://www.hiphoppoetry.com/vB/showthread.php?t=32828&page=7)
Made-up citation: "If God didn't want us to people the earth, he wouldn't have given us alcohol. Or crotchdar."