The wiki for get says:
Either the text "get" is in the picture, or the picture was uploaded where one of its tags or its image number reaches a milestone number, such as 100,000
While the first usage is objective, the second is meta. I propose only using the first definition and nuking the tag from posts that fit the second. I'll start doing it if there are no objections, but I don't see a good reason to keep it.