I don't teach swear words much; mostly I try to teach people not to swear if they don't mean to. This means saying "focus" instead of "fuck us" and "sheet" instead of "shit". Swear words with an accent often sound funny to my ears. Personally, I would be more impressed by a foreigner's level of English if I heard one of the expressions on this list, used in the right context, of course. This is native speaker English. Check it out.