Simp

Noun.

Short for "simpleton". Someone who goes out of their way to be kind to a person they want to have sex with,
typically to the point of sacrificing one's own dignity and allowing oneself to be walked over. Simping is typically considered a violation of prudential norms and is often considered irrational behavior, usually on the part of horny men.

"John Rivers from the Vox Veritas Discord server is a complete and utter simp."

"Gunslinger lets his own girlfriend snowball him. What a fucking simp."