Whoa, Alex--I am impressed! It seems to be part of our human nature to want to belong to a group, and quite often these groups develop their own way of communicating. Not exactly developing a whole new language, but certain usages, or alterations. When I was a teenager, my best friend and I took great delight in speaking "ofa"; make that when I was a young teen. But it served to separate us from the parents, or so we fondly believed. And here, certain board-specific usages have developed, the latest I can think of being 'mantled'.
There is a difference between doing something like this to say, "I belong", and doing it for the purpose of keeping others out. The difference may not be apparent to or appreciated by newcomers, but it IS there.