Early in the alpha phase of StarCraft II's development, Blizzard would release videos of gameplay footage, sometimes commented by Dustin Browder, and one of his oft repeated phrases during commentary was [player] or [unit] is doing some terrible, terrible damage. If you were a StarCraft addict like myself, you quickly became familiar with the phrase since you were hanging on every news about the game's development. Blizzard included a reference to this in the game itself too, in one of the scenes, a character calls for help, claiming that his ship has taken terrible, terrible damage just before he crashes. I think it's a cheat code too, though I'm not really certain since I haven't used any.

Here's a link to the StarCraft wiki article about it.