What'a an AMG?

Was chatting on "Whatsapp" with a young lady who is a graduate of Florida State University who majored in "monetary finance". For some reason, still to be determined, she looked me up on a website Expat.com

When she told me she had purchased an AMG for herself, I had no idea what kind of car it was. I looked it up only to learn for the first time it is produced by Mercedes. Learn something new every day, don't we?