Bi-noculars
The ability to recognise bisexual people by just looking at them. Much like a 'gaydar'.
Girl 1: So do you think that girl is straight?
Girl 2: Nah she's definitely bi.
Girl 1: Dude your bi-noculars are so good.
Girl 2: Nah she's definitely bi.
Girl 1: Dude your bi-noculars are so good.