A white out is a phenomenon that occurs when one consumes an excessive amount of alcohol. Like a black out, the consumer cannot recollect what happened the night before, but instead of waking up in a chair or bed on the bathroom floor, the person wakes up either in a hospital bed, or they wake up in heaven.
Matt - Yo man, sick party last night dude!
Darell - What are you talking about man? Todd had a killer white out.
Matt - Shit dude, is he okay?
Darell - Nah man, he's dead.