Mike Dirnt - Wikipedia, the free encyclopedia: "Michael Ryan Pritchard (born May 4, 1972) is an American musician, best known as the bassist, backing vocalist and co-founder of the American rock band Green Day. While at school, he would play "air-bass." While pretending to pluck the strings, he made the noise, "dirnt, dirnt, dirnt". As a result, his schoolmates began to call him "Mike Dirnt"."
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