Based

A word used to show approval of or agreement with a meme, video or other general post that is usually extremely sexist or misogynistic in nature. Particularly common in reddit comment sections.

Person A: *shows a meme*
Person B: *nods in approval* “Based.”

Another example:
Person A: “Dude, look at this based meme I made!”
Person B: “Damn bro, that’s so based.”