Source : Webster's Revised Unabridged Dictionary (1913)

Reefer \Reef"er\ (-?r), n.
   1. (Naut.) One who reefs; -- a name often given to
      midshipmen. --Marryat.

   2. A close-fitting lacket or short coat of thick cloth.

Source : WordNet®

reefer
     n : marijuana leaves rolled into a cigarette for smoking [syn: {joint},
          {marijuana cigarette}, {stick}, {spliff}]