probably from a variant of jolterhead
chowderhead (plural chowderheads)
- (US, informal, pejorative) An idiot; a dummy.
- Did you seriously think that was gonna work? You magnificent chowderhead! I saw that coming miles away!
- 2003: Thomas Petchel, Java 2 Game Programming 
- Now when you run the program, you should get output similar to the following: Attempt to access array out of bounds, chowderhead!