Baddiel is a term given for a very unfunny comedian or one who believes he/she is funny but really isn't.
We all piled into the minivan and made our way to Bracknell to see Donna McPhail doing stand-up. At one point during her act, she asked if there was a doctor in the house. There was. He replied "Yes, now tell me if there is a comedian?" She was sooo bad she was a Baddiel.