The absolute horror of having to be friends of someone of the opposite sex instead of having sex with them.
People who use this are in no way patheic losers who only see people of the opposite sex for their value and use to them, to the point where unless that person sees them romantically and sexually attractive, they are useless to them.
Person A: Ugh, Tiffany put me in the friendzone.
Person B: Thats Ok. She seems like a genuinely interesting and fun person.
Person A: But she won't have sex with me.
Person B: But doesn't she have more value than that? Shes an actual human being. Why is it so horrible that she wants to be friends?
Person A: Because since I want to have sex with her, she cant possibly have any value to me outside of that. People can't possibly have relationships just because you like a fellow human being and have respect for them.
Person B: Oh yeah you're right.
When that one guy keeps trying to talk and flirt with you but itβs actually annoying. You donβt even really want to be friends but you are a good person so you friendzone him through a definition in βUrban Dictionaryβ.