BIG KLUTZ is a term used to describe someone who is clumsy and awkward. The crossword solutions for this term are OAF (3 letters), LUG (3 letters), and APE (3 letters). OAF stands for 'OAFISH', which means having the characteristics of an OAF, or a stupid, clumsy, or awkward person. LUG stands for 'LUMBERING', which means to move in an awkward and clumsy manner. Lastly, APE stands for 'APE-like', which means resembling an APE in behavior or appearance.