You are my son
A term used to belittle someone, derived from Nicki Minaj's iconic rap verse "Bitch you my son, go and sit on the potty."

Saying this term usually means this person is beneath you, not on your level, or not worthy of your time. It can also mean that you are in control and this person needs to have several seats.
"You're ugly."
"You are my son, sit down."