MoCo's = Morning Cocktails
Usually, MoCo's are done before tailgating.
You wake up really early on a Saturday and simply start drinking. They work as a good pregame before the tailgates, which often only have bad beer to be used to maintain your drunkenness.
If you're a girl, you can also call it Morning Cocks.
Annoucement: MoCo's are at 8 am at our house, followed by a walk to the buses to the game, where we have tailgates all set up with burgers and Natty.