bi-eyeing

Checking out someone of the same sex even though you're definitely not gay nor bisexual.

Female: the other day at the gym i saw a girl that was gorgeous and she had this AMAZING ass and i waited in the locker room for an extra 5 minutes hoping i would just "run into" her
Male: Wait, you're a lesbian?
Female: Nope, it was just absolutely perfect, no joke. I didn't even want to hit on her, i just wanted to tell her how beautiful alllll that was.
Male: Ah, so you were bi-eyeing her!
Female: EXACTLY!