1. An ugly girl who protects her really drunk friends (sheep) at the end of the night as the bars are closing. Any attempts to get at the sheep will be intercepted by the sheep dog.
2. cock block
Box Buster: "Hey Bichard, those girls look fucked up lets go see how many of them we can get back to our place"
Bichard: "I don't know man that big ugly sober one in the back looks like a sheep dog. That sheep dog is going to try to block our game until she has herded her friends home"
Box Buster: "That's why you're here Bichard, jump on that grenade"