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From The Collaborative International Dictionary of English v.0.48:
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. [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