greaser:
(plural: ‘greasers‘; pronunciation: the letter ‘g’ in this word rhymes with the letter ‘g’ in the word “garden” — for the right pronunciation, please click here)

locomotive greasers at work
a person who applies grease on the working parts of a machine ;
(less commonly) a mechanic;
a worker who works at the engines of a ship;
a person belonging to any of the Latin American countries, especially Mexico [not to be used in formal speech];
a tough young man with long hair who likes cars and motorcycles, usually belonging to a gang/group;
a worker/employee who acts like a good worker or flatters his superiors in order to make their superiors like them,

a gang of greasers
As the machines and engines have become more sophisticated with automatic grease system, the job of a machine greaser has become obsolete in modern day.
Some sociologists feel that the greasers of the 1930’s and 1950’s are making a come back in the present societies all over the world.
There are greasers in every organisation, especially in mass media sector, who flatter their mentors or customers in the hoping getting personal favours.

a greaser (tool) for greasing a machine
