The Collaborative International Dictionary of English v.0.48:

Choky \Chok"y\ Chokey \Chok"ey\, a.
   1. Tending to choke or suffocate, or having power to
      suffocate.
      [1913 Webster]

   2. Inclined to choke, as a person affected with strong
      emotion. "A deep and choky voice." --Aytoun.
      [1913 Webster]

            The allusion to his mother made Tom feel rather
            chokey.                               --T. Hughes.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chokey
    n 1: British slang (dated) for a prison [syn: chokey, choky]