Quote Originally Posted by brett friggin favre View Post
being a conjunction, and profanity, it is not truly considered a word in a grammatical sense. because of this, its spelling is dictated by those who use it, rather than being subject to typical language guidelines. the generally accepted spelling is "dumbass" because when you say it, it comes out as one word. there's no real pause between "dumb" and "ass" unless you're foreign.
hyphenation is also valid