When you have been drinking for an extended period of time and one's memory begins to fade due to the high blood alcohol content, yet can remember certain things/events, just not everything from that day/night.
When his friend Ian asked if he blacked out last night, Robby replied: "No, I think it was more of a brown out because I remember talking to that fat girl at the bar, but I don't remember seeing you."
When you smoke a large amount of tobacco and get a massive head rush to the point where you feel like passing out. Symptoms include, dizziness, nausea, and vomiting.
Dude that cuban we smoked is gonna make me brown out, im so head rocked!