> "Based" is a catchphrase of the extremely online right. It basically means "cool" but with a subtext of "is annoying to libs/normies who just don't get it."

It is also a catchphrase of the extremely online left with exactly the same in-group vs. out-group implication (and, amusingly—because of the different meanings of “liberal” and “lib” favored by the two sides—usually identical meaning with regard to “libs/normies”.)