An extremely large male, beyond gifted at baseball yet also has tendencies to display random acts of confusion, sometimes appearing to be in a black out state or suffering from severe retardation.
Bob: Did you see that first baseman hit for the cycle last night?? Amazing!!
Joe: Yeah, but when he tried to bat for the wrong team while wearing a cape and a Santa Claus cap I knew we were seeing a Bigrichie!
Bob: Hey batter batter!