Except that the only time he will most likely say "SO" is in this thread only. So yeah, useless. Even then if he says "SO" again he will still have to explain it to anyone who hasn't even seen this thread or people that don't care so they forget.
no, not useless. he explained it in the OP so there are no worries, you can say it as much as you want in this thread and it doesn't matter because anyone who is not handicapped will understand
not to mention the fact that most people know what it means to begin with
but regardless of any other variables there is no way you can say that it is useless because he was able to use it twice without explaining it
the future does not matter in any way because it has already served its purpose
they think they are lol
half of them will "straight"en up when they grow up and know wtf they are doing with all those prepubescent thoughts.
good for you