A "stage name", if you will. The rockers usually use this so that fans everywhere will know them by something a bit more catchy than their real names.
Mike Dirnt. His real name is Mike Pritchard, but Dirnt is a name you will remember more easily. So, Dirnt is his "punk rock last name."
a false last name of "punks". this started with johnny rotten and sid vicious of the sex pistols. young punks still use this today such as Mat Decay, Mike Virus, Tara Heroin, Shar Nightmare, Ashely Cunt and such.
check out Mat Decay and Tara Heroin they are so punk rock.