As in other definitions, used to describe a person deemed of a lower, more worthless social rank. Created by George Orwell in his book "Nineteen Eighty-Four", to describe the lower insignificant classes of the fantastical British state.

When you eat dirt for the first time and leave your family to build a shack in the woods

From "proletarian" meaning wage-earner or worker. The shortened version being a derogatory term used by the middle and upper classes to deride the working class majority.

from the word proletarian -
1. a member of the working class (not necessarily employed)
2. a person whose only contribution to the ongoing of the community is to produce offspring and pay taxes

A person who is so uninformed and so stupid, they are literally incapable of ever having a chance of developing any kind of political, social, or economic importance or power.

(noun) Alternate term for "annoying new person" or n00b. Used to confer a lower social rank on the person by the person delivering the insult.