What is the definition of Aaasss?

"Aaaasss" is the British slang term for "awful" or "terrible," but it's also the sound a man emits when he's about to vomit or when he's so frustrated that he decides to throw a pillow at the ceiling. Now, here's a sentence that might just give you a chill: "The actor's performance was so aaaasss terrible, I couldn't even hold my own in the dressing room."