SirMishy is one of the users that was on the server that Arin and Ross were playing on during the Loadout episode of Steam Train. Being on the opposite team he was the person that was being killed the most by the grumps. It became a recurring theme in the episode for them to intentionally go after him and kill him. They made a joking assumption that he may be from Switzerland because he has bad ping and that he doesn't know how to get a working ISP.
SirMishy is actually from Australia, which explains for the bad ping he had during the game. It is a known fact that if you play Sid Meier's Civilization V with him, he will never end his turn.