I occasionally use "retarded" when chastising myself or other friends. I know it's not Politically Correct, but am I only allowed to say stupid? How long before we can't say that anymore?
Other words like "ignorant" don't work well because well, I don't like that word because it's misunderstood (even though it works well for how I say retarded . . for me it's like if you don't know something you should know).