A lot of guys call tattoos "tramp stamps". Having a tattoo is fine, as long as it's in a place where it can be covered up if need be, and is original and tasteful. Having a tattoo somewhere where you're constantly flaunting it, and having something overused like a devil, rose or Chinese lettering; which could say "Spring Roll" for all you know; does not look good.
Also, don't know if I've mentioned this, but jeans and trousers with words on the butt. Especially "juicy".