I call my cat Crackhead, but the name suits him perfectly... he's always fidgeting with stuff and messing it up or knocking it over (like an actual crackhead), and he rockets around the house like a meteor at all hours of day & night. I don't usually call my cats bad names, I may say things like "Blasted varmint!!!" and "Godd@% Crackhead!!!" But normally I don't sweat the small stuff... however, knocking over a full beer after I just set it down is generally good for a blast of seafaring language, LOL. 
Rain is a "little gray b*tch", but it's always said lovingly, because she's always messing with the @$$hole, trying to play with him and being a spunky kitten... she plays rough sometimes! She steals his food, too (and he steals hers!) She "attacks" our feet through the quilts when we're trying to sleep, she burrows under the blankets and spreads herself out so that we only have about 2 inches of space apiece. How does a little kitten make herself so BIG!? Of course we call her that name as we're gently scooping her up to cuddle... "Aw, come here, you little gray...", or gathering her up to separate her from the old guy so that he can have a moment's peace. Schrodie is also known as "little brown b@$tard", "dip$**t", "little 'effer'" (we say the word!)… but "I love you, you little brown b@$tard". We are rather free with our language here, we cuss shamelessly like sailors, definitely not suitable for children, but we never use those names in anger or in a harsh tone. Nor do we use those names during training or correction, always proper names when giving an instruction: "Rain, come" or "Schrodinger, off", or "Good boy/good girl!", or "No, Rain". The naughty names are always used in a friendly and loving tone, and in play only.
