Mum Jeans Posted in M Best definition Mum Jeans Really outrageously gross jeans worn by boys in their late teens, usually purchased by their mothers. Check him out in his mum jeans and silver astroturfs D: How satisfied are you with the definition? Looking for Mum Jeans meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 38 times.