ogg

Ｔｈｅ Ｓｕｐｒｅｍｅ Ｋｅｋ

Ogg literally translates to kek (which literally translates to lol) on World of Warcraft. When someone from the Horde side types kek (when they want to say lol, but in their language) in /say, members of the alliance side see ogg instead. Not specific to Orcs.

Human Paladin: Dude, that Orc totally just pwned you.

Orc: Ogg.

Human: Dude, now he's laughing ｍａｋｉｎｇ ｔｈｅ ｓｕｐｒｅｍｅ ｋｅｋ at you. Kick his ass.