This was when the community started to standardize names, since at this point people just used the full name of the classes involved.
At this time RMP was pretty much the only playable comp at high level, and only as Sub/Frost/Disc. The history of naming things 'Cleave' actually has a derogatory connotation that dates back to Burning Crusade. I've been actively involved in WoW 3v3 since Season1, which unfortunately also includes active involvement in both Arena Junkies and the WoW PvP forums.
I hear the question all the time - 'why is Rogue Hunter Priest called ThugCleave?' and figured I'd lay it out for anyone interested. Hey all - I posted this in a r/worldofpvp thread, but thought the rest of you may enjoy it.