Simp

A dude that bends over backwards to please a chick they like with the girl often having no interest in the guy with him trying desperately anyways. Who is willing to defend and give an arm and a leg for her approval or hopes of a relationship/sex and stand up his boys or his own stuff for her.

"Rachel doesnt like my boy finn, he needs to stop being such a simp for her he's wasting his time"