Source : Webster's Revised Unabridged Dictionary (1913)

Greaser \Greas"er\, n.
   1. One who, or that which, greases; specifically, a person
      employed to lubricate the working parts of machinery,
      engines, carriages, etc.

   2. A nickname sometimes applied in contempt to a Mexican of
      the lowest type. [Low, U. S.]

Source : WordNet®

greaser
     n : offensive terms for a person of Mexican descent [syn: {wetback},
          {taco}]