This is probably the least problematic page explaining this, but it's a series of white supremacist cartoons that became 4chan memes - huge CW racism, white supremacy, SA, antisemitism, and probably a dozen other things: https://knowyourmeme.com/memes/people/a-wyatt-mann

In short, it's from an extremely racist cartoon with a panel of a racist chariacture of a black person talking "gibberish".