[1] : The Collaborative International Dictionary of English v.0.48

jerker \jerk"er\, n.
   1913 webster
   1. a beater. obs. --beau.  fl.
      1913 webster

   2. one who jerks or moves with a jerk.
      1913 webster

   3. zool. a north american river chub hybopsis
      biguttatus.
      1913 webster
see also:
hybopsis biguttatus 

[2] : WordNet (r) 2.0

jerker
     n : someone who gives a strong sudden pull syn: yanker
see also:
yanker 

Jerker >> J Words
Jerker, definition of term: Jerker
jerker_pag1.html