You hit the nose on the head

If you type this malaphor on a google search, you get hundreds of responses, reflecting how often this malaphor is written/spoken.  It is a blend of “hit it on the nose” and “hit the nail on the head”, both phrases meaning getting something exactly right.  I suspect the confusion here is also prompted by two words that are both body parts and four letter words.   It also could be from watching too many Three Stooges comedies.