Being deleted or removed from a tangible or intangible place because you are not important enough to justify your existence in said place.
The origin of this definition is, of course, the A7 rule in Wiki against creating pages on people or organizations without showing how they are significant.
"Dude, Scott got A7'd from Wiki because they don't think he is an important or notable figure."
"I A7'd Kevin from the invite list... he's not important."
"I A7'd Caleb from the invite list... he sucks."