A word used to describe someone who does things or behaves in a way that is embarassing, nerdy or wimpy.
Brian was such a ham when he tryed to ask that woman for her phoner number. Being alone on a saturday night is just pure ham life. Look at that guy dancing, such a ham. He totally Hammed out tonight when we made plans to go out partying. I can't believe you hammed out on paying the bill at the restauraunt.