Mucked UP Posted in M Best definition Mucked UP Messed Up, Fucked Up. Somethin u did or a place. Man thats really Mucked Up how U snitched Mucked UP: define #2 Mucked up To have messed up, to have made a mistake I mucked up when I went after him. How satisfied are you with the definition? Looking for Mucked UP meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 96 times.