Bitchdar
Similar to gaydar, but with bitchy women.
Guy 1: Dude, that girl's smokin'. I'm going for it.
Guy 2: Don't try it dude, my bitchdar's going crazy. She's trouble.
Guy 2: Don't try it dude, my bitchdar's going crazy. She's trouble.
Bitchdar
Like Gaydar (Gay radar), Bitchdar is a portmanteau; a word formed by combining two different terms, in this case "Bitch" and "radar". "Bitchdar" can be defined as a persons ability to recognize or assess a situation in which someone else is trying to take advantage of them; to use them for their own gains; to make them their bitch.
My bitchdar is telling me this person is befriending me only because my family is rich.