Source : Webster's Revised Unabridged Dictionary (1913)

Bumpkin \Bump"kin\, n. [The same word as bumkin, which Cotgrave
   defines thus: ``Bumkin, Fr. chicambault, the luffe-block, a
   long and thick piece of wood, whereunto the fore-sayle and
   sprit-sayle are fastened, when a ship goes by the winde.''
   Hence, a clumsy man may easily have been compared to such a
   block of wood; cf. OD. boomken a little tree. See {Boom} a
   pole.]
   An awkward, heavy country fellow; a clown; a country lout.
   ``Bashful country bumpkins.'' --W. Irving.

Source : WordNet®

bumpkin
     n : not very intelligent or interested in culture [syn: {yokel},
          {rube}, {hick}, {yahoo}, {hayseed}, {chawbacon}]