Original coined by the band Turbonegro. The term Bad Mongo refers to an individual of lower intelligence and prowess than the average human being. Common sense and reasoning eludes such an individual who considers an iron cross his lucky charm. You can recognize a Bad Mongo by his wild eyes, dribbling tongue and a 'fuck the world' tattoo on his arm. Also considered a "genetic nightmare" in streets which are not safe anymore.
"Bad mongo, he's gonna kill you in the face"
"It's the Bad Mongo man"
"Bad Mongo got a very big knife"