noun. A keen, playing-with-confederate-money-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, hottie-dar, weirdo-dar, jerk-dar, moron-dar, dorkdar, skankdar, freak-dar, ass-dar, zombie-dar, Pretentious Club-going New York Assholedar, "someone is staring at my ass"-dar, “Jesus Freak” dar, jailbait-dar.
Real citation: "Did Mimi on Days of Our Lives get fake boobs? We're just up to the bit where Philip is going to rent her half of the loft, and as she stood there in her (awful, horrible) crochet shawl, I suddenly noticed that her new (glaring, orange) huge breasts were filling half the screen. Snookums was unable to confirm (and he usually has good fake-boob-dar). Any opinions?"
(Kristine Michelle Howard, Feb. 16, 2005, http://www.web-goddess.org/archive.php/postID/4678)
Made-up citation: "With my fake-boob-dar and SAT scores, I feel I would be a fine addition to Mensa."