spanker

1. The spanker and the spanked.
   打屁股者和被打者。

noun

1. a fore-and-aft sail set on the aftermost lower mast (usually the mizzenmast) of a vessel

2. a hitter who slaps (usually another person) with an open hand
   1. someone slapped me on the back and I turned to see who the slapper was
   2. my father was the designated spanker in our family

   Synonym:    slapper