I want to state that I have no idea.
But I'd like to imagine that they picked the name "gores" because of the similar word.
Why? You may ask.
Well, my theory is, that this game-mode demands so much focus, precision and skill. Plus, it also being so extremely harsh and punishes dearly you for any minor mistake. No checkpoints, no saves, just instant death. No matter how far you might be into the map = It's "disgusting" - like the meaning of the similar word. (edited)