A term used by incredibly butthurt little boys in relation to the fact that the girl they like doesn't want to fuck them. It's an excuse the little boy makes to make the girl look like she's doing something wrong when the little boy is really just over egotistical and/or an asshurt sore loser. The little boy just doesn't want to accept the fact the girl doesn't want him.
Tyler: That fucking bitch fucking friend zoned me!
Anna: Shut up, your ego will live.
Tyler: She's just a stupid slut, every guy she dates is a douche!
Anna: You're just butthurt because she doesn't want you.