Jeffie started showing up in the early 2000's back when it was just Rick and Joe. Jeffie was an experiment, Azkath from The Last Exit for the Lost tried to clone himself, and it failed. Instead he got Jeffie. Looks a bit like Azkath, but that is about it. Jeffie could be called stupid, but naive is more accurate. They have killed Jeffie. Many times. Azkath always makes more. It's like a cruel joke. Everyone has now lost count of how many Jeffie's there have been.
Jeffie likes most all music, especially loves local bands, and thinks of himself as a great interviewer and main star of the show. He also has some splinter personalities like Thor and Pepe, the less said about which, the better.