https://en.m.wiktionary.org/wiki/based

Adjective

based (comparative more based, superlative most based)

(slang, of a person) Not caring what others think about one's personality, style, or behavior; focused on maintaining individuality. 

(Internet slang) Admirable; praiseworthy.

    (Internet slang, originally 4chan) Admirable for rejecting liberalism or left-wing values.