acronym for make up air, a unit which pulls in fresh air into an interior space which air has been removed due to exhaust fans therefore balancing the air pressure. a mua unit is commonly found in a restaurant's kitchen but it can be used in any space where exhaust fans are present
Gotta call my hvac tech since my mua unit broke down and now my kitchen sucks.
when somebody makes a joke he says mua to let everybody know it wasn't serious. Or if you make fun of someone you can say mua to let them know you ain't trynna hurt their feelings or skmething
person A: You took that girl out for lunch?
person B: No i was busy wit yo mom Mua