"You do it for me" is an expression meaning, roughly, "I find you completely attractive." The expression is also used to refer to things (not just people): Someone looking for a new place to live: "This apartment does it for me." ("This is ideal.")

Do it for someone meaning?

1. . to provide for someone; to take care of or serve someone. Do you expect me to stay home and do for you for the rest of my life? I can't do for all of them! 2. to suffice for someone; to be sufficient for someone.

Do do me meaning?

Urban Dictionary: "Meaning, have sex with me." In other contexts, it can me 'perform a service' in a more general way, such as asking a hairdresser 'Can you do me next?" in which case 'do me' means 'cut my hair'.