A simp is a guy who does something nice for a girl, hoping that it'll make the girl want to date him, and then is wholly disappointed when she doesn't. It's based on the idea of being submissive to your partner.
Yo bro, I checked Jake Paulsimping on that Erika chick. You know they only friends cause she out for the money
Simp is a word for a male who abandons his duties and character as a man. He will leave his friends in order to impress a girl he can't get. A simp is someone who acts like someone he is not in front of a female.
Carl: Aye bro you know Tanav?
Carlos: Yuh bruh he's such a simp.
Carl: You are totally right bro.