gaydar
Example:
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!
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!