From The Collaborative International Dictionary of English v.0.48:

jerkwater \jerkwater\ adj. [from jerk + water, a place where it
   is necessary to draw (jerk) water to supply the boiler of a
   steam engine.]
   1. small and remote and insignificant; as, a jerkwater

   Syn: one-horse, pokey, poky.
        [WordNet 1.5]

   2. (Railroads) Off the main railroad line. [Archaic]
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