hi
"zut alors" is really tamed. Extremely safe, but not a swear word.
I'm french, so no creole slangs, but I can give you a few words, which are pretty horrible.

"Merde" is truly one that everyone pretty much uses everyday. translate as "[poo]"
"Fais chier" literaly means, "dumping a pooh" quite rude, but used when really agravated.
we have lots of words to describe people in a horrible way.
birds name for idiots: tête de linote, for someone who never remembers anything
un pigeon, for someone who's gullable
for a girl who's ugly, you'd say "c'est un thon" "it's a tunafish."
for someone who has no character: "c'est une chips" "it's a crisps."
the thing is slang in french tends to move really fast, much faster than in English.
but the ones I gave you are still in use, mind the "tete de linote" which is quite old fashion.
good luck