As someone who witnessed A-10 CAS fuck some stuff up in a combat zone ie the real “brrrrt” I’ve been mystified by the meme and current useage. No one knows where it comes from nor the slaughter it represents.
as intense as a a10 might be, it's short lived and only affects a few dudes on the receiving end. When the federal reserve goes brrr, it has far reaching impact that affects every single person in the global economy.