An old-fashioned way of saying shut up.
Guy 1: Hey Anna! Cut The Gas!
Anna: *cuts gas tank*
Guy 1: Why'd you stop the car?
Anna: Cause you told me to
Guy 1: I told you to SHUT UP!
Anna: Oh... Cool...
To choke yourself/partner during intercourse or masturbation or intentionally restrict the oxygen to the brain for pleasure
"She's a proper little dirty. Into getting her gas cut" "when we fuck how about cutting the gas?"