1. 
[syn: slapper, spanker]
The Collaborative International Dictionary of English v.0.48:
Slapper \Slap"per\, n.
   1. One who, or that which, slaps.
      [1913 Webster]
   2. Anything monstrous; a whopper. [Slang] --Grose.
      [1913 Webster] Slapper
The Collaborative International Dictionary of English v.0.48:
Slapper \Slap"per\, Slapping \Slap"ping\, a.
   Very large; monstrous; big. [Slang.]
   [1913 Webster]
WordNet (r) 3.0 (2006):
slapper
    n 1: a hitter who slaps (usually another person) with an open
         hand; "someone slapped me on the back and I turned to see
         who the slapper was"; "my father was the designated spanker
         in our family" [syn: slapper, spanker]