In his own words:
He is the Fat Man. He is the Fat Man After Dark. Created in a genetics laboratory from the splicing of the DNA of William Howard Taft, Grover Cleveland, Henry VIII, Mama Celeste, Mrs. Fields, and and Betty Crocker, the Fat Man first came to prominence as an internet radio host. His first show, aired as a one-time special on a politically progressive internet radio station in the winter of 2006, would set the e-world by storm. Unfortunately the Fat Man's brand of humor and controversial remarks by some of his guests would keep him offline for several months before finally finding his home on another station. On his return show, one of FMAD's friends in China emailed in as he was listening. Fat Man After Dark had defeated communism.
I may or may not have knowledge of the Fat Man's true identity, but I do know that he is a one-man central repository for sports, food, and gambling. Fat Man After Dark is for entertainment purposes only.