@khaleelkazi's thread
In case you've been hearing based a lot and don't know the meaning:
based
A word used when you agree with something; or when you want to recognize someone for being themselves, i.e. courageous and unique or not caring what others think. Especially common in online political slang.
The opposite of cringe, some times the opposite of biased.
The latter usage is the original use as coined by rapper Lil B, and the word originally took off on the meta-ironic website 4Chan with the latter meaning. For that reason the word is largely used meta-ironically (without context you can't tell if it's being used ironically or sincerely as it's used in both ways) and was popularized in online political slang of conservatives and the political right before being adopted into mainstream online political slang (likely through shitposting websites or subreddits such as r/politicalcompass memes that are similar to 4chan in their meta-irony and "edginess"
Via urban dictionary