Someone beyond the bounds of merely the word "dumb".
What are you, some sort of dumbnick?
Someone who enjoys lunch in excess.
That lunchard sure enjoys his/her lunch!
The next step above just being a regular bitch. The king/queen of bitches. The most derogatory term so offensive that it causes people that overhear it to "poot" (fart).
That's it. You've pushed me too far! You sir, are a Pootie Bitch! *poots*