Well, to start, the boys are named Monchichi Kitten and Atticus the Catticus.
Monchichi also goes by Munch, The Munch, Munchie, Bug, Stink, Greyboy, Small cat. My dad calls him "Munchasaurus Rex, King of the Munchasaurs."
Atticus is called Att, Bad cat, The big one, Sack-of-Potatoes, and my dad calls him "Atticus Catticus big and fatticus" (or alternately "big and baddicus"). We also say that "Atticus' badness level is exceptionally high for a cat his size."
A typical conversation in our house goes as follows:
"Oh my god..."
"I'm gonna be sick!"
"Look at Munchie"
"Oh my god.. he's so cute"
"I know! It's disgusting!"