Another name for an person who does something stupid or embarassingly funny.
Term came to be after an incident in where a gentleman in a wheelchair was stuck on a grill of a Semi Truck wearing a "I'm a Pepper" T-Shirt. He was unharmed. "What a Harold" term used to be the describtion for the same thing. Was then changed to "What a Pepper".
Eddie: "Dammit, I just locked my keys in my car."
Davey: (laughing)... "Whatta Pepper!"
Eddie: "Look! Allen just busted his ass."
Davey: "HA HA HA.....What a Pepper"