Full of the moon

from The Collaborative International Dictionary of English v.0.48

Full \Full\, n.
   Complete measure; utmost extent; the highest state or degree.
   [1913 Webster]

         The swan's-down feather,
         That stands upon the swell at full of tide. --Shak.
   [1913 Webster]

   {Full of the moon}, the time of full moon.
      [1913 Webster]