"OUTRAGEOUS!" is OK. If you roll the R, people will assume you're putting them on. If you have a thin, curly moustache and a monocle, you can follow this up with some good Olde Englishe Exclamations like Balderdash, or Double Balderdash, or the mind-warping Triple Dog Balderdash. You can slip in some Dickensian nonsense. Heck, slip in a Dickensian sentence: "The felicitous idea occurred to me a morning or two later when I woke that the best step I could take towards making myself uncommon was to get out of Biddy everything she knew. That horrible cunt."

Zie Gezunt! is a reverse curse, a Yiddish nicety that, when said with the proper inflection (ie say it like a middle-American teenage headbanging pot smoker who has never known a single word of any language outside his own, someone who was just convinced that this phrase is satanically irreverent, then hit him with a hammer on the big toe) it can be quite satisfying.

Anything starting with Mother and a verb. Currently Mothergrabber and Mothertossing Fathermasker are two local favorites, but sometimes the complexity is too much for the moment (ie "Motherhumping slack jawed yam handed bucket makers!" is a mouthful when you've been cut off in traffic).

Foreigners have a whole set of fantastic exclamatory curses, both witch and non-witchcraftian. Be careful, though: in a given area or community there may be more Swahili or Tagalog speakers than you bargained for. Me, I like the curses used by Texans when things get ornery. For instance, someone with the proper accent telling you that you're as ugly as homemade sin, as dumb as paint, and as useful as a box of broken heels, it's just neat. My favorite Texas-ism is "all hat and no cattle."

Marmoset! The animal kingdom is more than just food and pets. It's a source of decent exclamations, too. Hippopotamus! Mothergrabbing hamster hopper! (see how I neatly combined two areas there?)

Made up words may work better than you anticipate; I now have most everyone at work using "gablahgablahgablah" to describe a very specific sort of stupid person.

How about you? What are you favorite non-cursing censor-friendly curse words?