The Collaborative International Dictionary of English v.0.48:

honky-tonk \honky-tonk\ n.
   1. a cheap drinking and dancing establishment; a cheap and
      tawdry nightclub.

   Syn: barrelhouse.
        [WordNet 1.5]

   2. A district in which honky-tonks[1] are found.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

honky-tonk \honky-tonk\ a.
   Pertaining to or resembling a honky-tonk.
   [PJC]

   2. (Music) Pertaining to a style of ragtime piano music
      having a melody embellished with chords and syncopated
      rhythms, accompanied by a bass in strict two-four or
      four-four time. It is often played on an upright piano
      having its strings muffled to produce a tinny sound; as, a
      honky-tonk piano. --RHUD
      [PJC]

WordNet (r) 3.0 (2006):

honkytonk
    n 1: a cheap disreputable nightclub or dance hall [syn:
         honkytonk, dive]