In the States, when you want to say s#*t without actually saying it, we use "crap". Which is the exact same thing, except it is not considered as vulgar as s#*t. It comes from the name for the man credited with inventing a mechanism for the water closet, Thomas Crapper.
So, instead of saying "Oh, s#*t!" We say "Oh, crap." Just like instead of saying, "Aw, f#*k it", we say, "Aw, screw it."