A word (usually an insult) used to describe somebody as being silly/a fool, etc. It can also be used as more of a loving/joking insult, meant for close friends, if you are that way inclined.
Upon retiring to their room after a romantic dinner, Paul suggested to his wife that he bury his tongue in Old Mossy Face for while. She agreed and was enamoured both with his charm and oral dexterity.