jerky \jerk"y\, n. [Corrupted from Peruv. charqui dried beef.]
   Meat, especially beef, that has been cut in strips and dried;
   meat that has been jerked; see first {jerk}, v.; as, beef
   jerky
   [PJC]

jerky \jerk"y\, a.
   1. Moving by jerks and starts; characterized by abrupt
      transitions; as, a jerky vehicle; a jerky style.
      
[1913 Webster]


   2. Foolish; ridiculous; stupid. [slang]
      [PJC]