greaser

Webster's Dictionary (GCIDE)

1.One who, or that which, greases; specifically, a person employed to lubricate the working parts of machinery, engines, carriages, etc. [1913 Webster]

2.A nickname sometimes applied in contempt to a Mexican or other Latin-American of the lowest type; -- derogatory and offensive. [Low, U. S.] [1913 Webster +PJC] grease gun