When you are sleeping somewhere other than at your house, a champagne breakfast is the act of urinating in a woman's mouth when she is asleep. If you miss her mouth, the act is a golden shower Of course, you wouldn't want to do this at your house, because you don't want to piss on your own bed.
Last weekend, I picked up a chick at the bar and took her over to my buddy's house and we hooked up. In the morning, I woke up first and she was sleeping with her mouth open. So, I gave her a champagne breakfast.