Source : Webster's Revised Unabridged Dictionary (1913)

Slouch \Slouch\, n. [Cf. Icel. sl?kra slouching felloew, and E.
   slack, slug, a lazy fellow.]
   1. A hanging down of the head; a drooping attitude; a limp
      appearance; an ungainly, clownish gait; a sidewise
      depression or hanging down, as of a hat brim.

   2. An awkward, heavy, clownish fellow. [Colloq.]

   {Slouth hat}, a soft, limp hat of unstiffened cloth or felt.

Slouch \Slouch\, v. i. [imp. & p. p. {Slouched}; p. pr. & vb. n.
   {Slouching}.]
   1. To droop, as the head.

   2. To walk in a clumsy, lazy manner. [Colloq.]

Slouch \Slouch\, v. t.
   To cause to hang down; to depress at the side; as, to slouth
   the hat.

Source : WordNet®

slouch
     n 1: an incompetent person; usually used in negative
          constructions; "he's no slouch when it comes to
          baseball"
     2: a stooping carriage in standing and walking
     v 1: assume a drooping posture or carriage [syn: {slump}]
     2: walk slovenly