simp

A "simp" is a person (traditionally a man) who is perceived as being excessively subservient, attentive, or submissive to someone they are attracted to, usually in the hope of receiving romantic or sexual attention. The mental image is someone who goes far beyond normal kindness, often sacrificing their own dignity or resources to please someone who does not reciprocate their feelings. The term is highly informal and carries a derogatory, mocking tone. It is frequently used in online gaming and social media subcultures to shame men for being "too nice" or for "putting women on a pedestal." Because it is a pejorative, it can be offensive and is generally avoided in polite or professional conversation.
In conversation
Gaming lobby
Dude, why did you give her all your high-level gear?
Dude, why did you give her all your high-level gear?
She said she needed it for the quest!
She said she needed it for the quest!
Stop being such a simp, she’s just using you.
Stop being such a simp, she’s just using you.
Used here to suggest that the person is being manipulated due to romantic interest.
Social media comment section
I just sent her another fifty bucks for her stream.
I just sent her another fifty bucks for her stream.
Simp alert.
Simp alert.
'Simp alert' is a common shorthand to call out perceived sycophantic behavior.
Examples
He is such a simp for her.
He is such a simp for her.
I'm not going to simp for someone who doesn't even know I exist.
I'm not going to simp for someone who doesn't even know I exist.
The influencer laughed as the chat accused her top donor of being a total simp.
The influencer laughed as the chat accused her top donor of being a total simp.