>>2729950There's no universal agreement on where and when it originated, but I can tell you it was widespread enough by the late 80s to appear frequently in NZ classrooms back then. At the time my older brother told me he invented it but, given the other things he claimed to have invented (including but not limited to the skateboard and the word "fuck"), I harbour doubts about that. There's a Wikipedia page for it under "cool S" but it's not particularly interesting or illuminating.