the ability to sense--without being told and withoutobvious visual clues--that someone is gay.
Female A: He may be fine as frog hair but you won't get anywhere with him because he's gay.
Female B: How do you know?
Female A: 'Cause I've got GAYDAR!
A form of gaydar most commonly, but not always found in persons with ambiguous sexuality or faghags. It does have glitches and occassionaly fails, specifically with short-term scans such as 'first glance'. It's two main functions include a shock absorber for when someone comes out of the closet and finding potential hook-ups for one's gay counterpart.