Gidget Gein is most famous as the former bassist of Marilyn Manson & The Spooky Kids. He was born Bradley Mark Stewart on 9/11/69 in Florida, where he lived for most of his life.
In his early adult life, Brad went to clubs and DJ'ed for some, bumping into Brian Warner (Marilyn Manson) multiple times. After kicking out their former bassist, Manson invites him to be their replacement. Brad thus dubbed himself "Gidget Gein" in the famous pseudonym fashion of the band: Gidget, after the famous 60's TV star surfer gal, and Gein, after the grave-digger and serial killer Ed Gein.