The Collaborative International Dictionary of English v.0.48:

Spat \Spat\, v. t. [imp. & p. p. Spatted; p. pr. & vb. n.
   Spatting.]
   To slap, as with the open hand; to clap together; as the
   hands. [Local, U.S.]
   [1913 Webster]

         Little Isabel leaped up and down, spatting her hands.
                                                  --Judd.
   [1913 Webster]