Originally meant a person who supported the idea of the superiority of the Aryan Race and the degradation of other races
like Jews. Nazis were
people who promoted/promote the ethnic cleansing of a race other than the Aryan Race. The word was coined by Joseph Goebbels (The Minister of Propaganda in the Third Reich) as an abbreviation of the ideology of 'National
Socialism'.
Nowadays, it's a buzzword tossed around in the realm of politics as a way to dehumanize/demonize an opponent to one's opinion (mostly used by the
far-left) or to express something you don't like or agree with, like the usage of the word 'communist' by the US
people in the Cold War. The word is used as a generalization of a certain community nowadays, mainly the White Conservative community.