Lyric discussion by DavidGrimmer 

Cover art for Dr Worm lyrics by They Might Be Giants

doortodoor hit the nail right on the head. It's a song about a guy who plays the drums in his basement and dreams of becoming famous.

The "I'm not a real doctor" line comes from a line of ads in the 70's. There was a TV actor who starred in some soap opera as a doctor who was hired to plug medicine. The commercial featured him sitting in a doctor's office with a white lab-coat on... however, there were scandals back in the early days of TV advertising because having a non-doctor in a white lab-coat pushing your product was seen by many as a form of deceptive fraud. Therefore, he opened the ad with the unintentionally hillarious line "I'm not a real doctor, but I play one on TV."