(noun) (US: Mombulance) The name given to the vehicle (and driver) that comes to rescue you from a drunken emergency, anytime after 3am. The mumbulance is usually only called as a last resort. The mumbulance is always driven by the victim's mother.
The mumbulance is a service provided by the Mum brigade.
A: "How the fuck did you get home last night? You were wasted! Did you get a cab?"
B: "No, I lost my wallet and threw up. I had to call the mumbulance. She wasnt happy."