Sido is the stage name of the Berlin rapper Paul Würdig (born November 30th, 1980), one of the most successful artists of the German record label Aggro Berlin. Sido distinguishes himself through uncomfortable, provocative, aggressive lyrics. He often wears a silver mask.
The name is an abbreviation that is spelled as "super-intelligentes Drogenopfer" = "super intelligent drug victim". However this is the new interpretation while originally the name did spell as "Scheisse in Dein Ohr" = "shit (goes) into your ears".