The Collaborative International Dictionary of English v.0.48:

Topful \Top"ful\, a.
   Full to the top, ore brim; brimfull. "Topful of direst
   cruelty." --Shak.
   [1913 Webster]

         [He] was so topful of himself, that he let it spill on
         all the company.                         --I. Watts.
   [1913 Webster]