Having a beer as a first drink of a new day or early in the morning. Drinking a beer with breakfast rather than apple juice, orange juice, or yoohoo.
Guy: Dude that was a wicked party last night. You want some coffee or water?
Guy's buddy: Nah man I got a major hangover, I'm gonna drink a brewhoo.
Guy: Oh brave move, the ol' breakfast of champs. I can't even look at beer right now.