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 4 times.