The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

jerky
    adj 1: lacking a steady rhythm; "an arrhythmic heartbeat" [syn:
           arrhythmic, jerking, jerky]
    2: marked by abrupt transitions; "choppy prose" [syn: choppy,
       jerky]
    3: having or revealing stupidity; "ridiculous anserine
       behavior"; "a dopey answer"; "a dopey kid"; "some fool idea
       about rewriting authors' books" [syn: anserine, dopy,
       dopey, foolish, goosey, goosy, gooselike, jerky]
    n 1: meat (especially beef) cut in strips and dried in the sun
         [syn: jerky, jerked meat, jerk]

Moby Thesaurus II by Grady Ward, 1.0:

154 Moby Thesaurus words for "jerky":
   aspic, barbecue, beef, beef extract, beef tea, boiled meat,
   bouilli, bouillon, broken, broken off, bully, bully beef,
   capricious, careening, cataclysmic, catchy, changeable, changing,
   charqui, chipped beef, chopped-off, choppy, civet, convulsive,
   decousu, desultory, deviating, deviative, deviatory, different,
   disastrous, disconnected, discontinued, discontinuous, discrete,
   disjunctive, disorderly, divaricate, divergent, diversified,
   diversiform, dried beef, eccentric, eclamptic, episodic, erose,
   erratic, fidgety, fitful, flesh, flickering, fluctuating,
   forcemeat, game, ground beef, guttering, hachis, halting,
   hamburger, hash, herky-jerky, heteroclite, immethodical, impulsive,
   incoherent, inconsistent, inconstant, intermittent, intermitting,
   interrupted, irregular, jagged, jerking, jiggety, joint,
   jugged hare, jumpy, lurching, meat, menue viande, mercurial, mince,
   motley, mutable, nonconformist, noncontinuous, nonlinear,
   nonsequential, nonserial, nonstandard, nonuniform, orgasmic,
   parenthetic, paroxysmal, pastrami, patchy, pemmican, pluralistic,
   pot roast, ragged, rambling, roast, roast beef, rough, salt beef,
   saltatory, sausage meat, scrapple, scrappy, seismic, snatchy,
   spasmatic, spasmic, spasmodic, spastic, sporadic, spotty,
   staggering, suet, suspended, twitchety, twitching, twitchy,
   uncertain, unconnected, unequable, unequal, uneven, unjoined,
   unmethodical, unmetrical, unorthodox, unregular, unrhythmical,
   unsettled, unstable, unsteady, unsuccessive, unsystematic,
   ununiform, upheaving, variable, variegated, variform, various,
   varying, veering, vellicative, venison, viande, wandering,
   wavering, wobbling, wobbly