The "courier" is a specific type of ally minion in Dota 2: one that carries stuff to you when you're too busy fighting in lane to make that tiresome trek back to your base.
So imagine playing Dota 2, one of the hardest games ever created. You're in the heat of battle, wondering if you should grit your teeth and stick it out for another round of fighting with your lane enemies or take a breather and head back to base. You're wondering how much longer you're gonna make it and oh god where the f**k is that new sword --
And then... uh... goat shows up!
You know, that goat. Mr Goat. Of Goat Simulator fame.
You can vote for this amazing thing to happen right here .
Oh, and one more thing: ༼ つ ◕_◕ ༽つ