a semiskilled engine attendant aboard a merchant ship
3.
a young long-haired motorcyclist, usually one of a gang
4.
an unpleasant person, esp one who ingratiates himself or herself with superiors
greaser in American English
(ˈgrisər)
noun
1.
a person or thing that greases
2. US, Slang
a poor or working-class youth, esp. in the 1950s, often characterized as being rough in manner, wearing a leatherjacket, having oily hair, riding a motorcycle, etc.
usually a somewhat derogatory term
3. Slang
a person of Latin American, specif. Mexican, origin
a term of contempt or hostility
Word origin
(sense 3) from stereotypical notions that such persons have dark, oily hair