Australian Colloquial for the band AC/DC. I think AC/DC must be the most common graffitti phrase in Oz. I remember when Christians kicked up a big fuss, because they believed AC/DC to be evil incarnate, and thought that AC/DC stood for Anti Christ/Devil's Child. I heard that Angus Young actually saw the term on an electric sewing machine and thought of - electric power metaphors (high voltage rock'n'roll, Flick of the switch). I know someone who has one of Angus' old School uniforms.