F&M
A short way to ask if someone's a boy or a girl. Used in chats like it's a life-or-death situation. It's just a question, but it feels like it's the end of the world.
'Are you F or M?' I said. He said, 'I'm a ghost.'
She asked me F or M. I said, 'I'm a wizard.'
He asked me F or M. I said, 'I'm a pizza.'