What is the full form of AOT slang?

Excuse me, could you please clarify for me the meaning of the slang term "AOT"? I'm not entirely familiar with its full form and I'm curious to know what it stands for in the context it's often used in. It seems to be a popular acronym in certain communities, and I'd appreciate it if you could provide me with the complete and accurate version of it. Thank you in advance for your help.