Each individual cat gets a ton of nicknames, but for cats in general... (aside from those I've seen listed...)
Nice names: Mauser, Moggie, Kik-a-now, Meekie, Kit-kit-kit
Less flattering: Little Puker, Litterfeet, Troublesome Joe
I also like to refer to them as "couch panthers" or "house lions" but that's not something I call them directly.