That strongly depends on your kinks. Slut and whore are simple ones. Depending on the circumstances I have seen these work well as well: bimbo, desperate, pathetic, dirty, nasty, dumb, fuck hole, cuck, looser, cuckqean, worthless, not good enough, fat, ugly, smelly, anal slut /whore, pain slut/whore, toilet slut/whore, trash, white trash, worthless n***, miss tiny tits, small cock, bald, pig, cow, cock roach... Anything that gets a reaction for you works generally speaking. Find what you like and build your vocabulary up from there. Pro tip, you can combine words to phrases to make them be more meaningful.