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Explanation: de lo que entiendo por BAD BIKERS y BAD ASS BIKER, que son las referencias que he encontrado, es más una cuestión de que lo que se denomina BAD es porque tienen "a rotten attitude" hacia los demás
espero te ayude...
Others were saying, "Events about bad bikers are making it tough for the rest of us. No one even wants to come out to a charity event for fear that rival motorcycle 'gangs' will converge on the scene and kill us all."