Source : Webster's Revised Unabridged Dictionary (1913)

Whipperin \Whip"per*in`\, n.
   1. A huntsman who keeps the hounds from wandering, and whips
      them in, if necessary, to the of chase.

   2. Hence, one who enforces the discipline of a party, and
      urges the attendance and support of the members on all
      necessary occasions.