Source : Webster's Revised Unabridged Dictionary (1913)

Jerker \Jerk"er\, n.
   1. A beater. [Obs.] --Beau. & Fl.

   2. One who jerks or moves with a jerk.

   3. (Zo["o]l.) A North American river chub ({Hybopsis
      biguttatus}).

Source : WordNet®

jerker
     n : someone who gives a strong sudden pull [syn: {yanker}]