This is driving me crazy, short trip. What cartoon character was always saying 'ahhhhh shaaaaaadup' not sure if he/it slapped another character at the time or not.

found it...
http://www.youtube.com/watch?v=etBoJJ0GZI8

http://www.youtube.com/watch?v=ArSLNJNUEIM

Hmm...apparently the right answer is "Mel Blanc". lol I'm thinking there's probably a Bugs Bunny clip with that phrase in it, too, somewhere.

I'm thinking your right

Yeah, I'm pretty sure Bugs said it a few times.