This is posted in places on the internet purely to create confusion. Then they'll go to urban dictionary to look up the meaning, and see it has no meaning. When this happens, the person who originally posted it succeeds.
Person 2: Totally! I am super excited!
Person 3: amtc
Person 1: What?
Person 2: I don't get it...
Persons 1 & 2: *Go onto urbandictionary and look up amtc. They then facepalm.*