Source : Webster's Revised Unabridged Dictionary (1913)

Choker \Chok"er\, n.
   1. One who, or that which, chokes.

   2. A stiff wide cravat; a stock. [Slang]

Source : WordNet®

choker
     n 1: someone who kills by strangling [syn: {garroter}, {garrotter},
           {strangler}, {throttler}]
     2: an unfortunate person who is unable to perform effectively
        because of nervous tension or agitation; "he could win if
        he wasn't a choker"
     3: necklace that fits tightly around a woman's neck [syn: {collar},
         {dog collar}, {neckband}]
     4: a high tight collar [syn: {ruff}, {ruffle}, {neck ruff}]