AMA means Ask Me Anything
Translated into Dutch it is: Ask me everything (VMA) but normally the English abbreviation is used. It has become popular when the well-known site Reddit started with it and famous people were invited. (Obama, Bill Gates, Jerry Seinfeld, etc.). The AMA has been known for a long time, in the ' 90, the then AOL also had a chat room that Ask Me Anything as the title. Later It also became an item on forums and BBSen.