Partaking of too much leaf causing sudden nausea and a draining of blood from the face - hence the 'white'. Usually followed by upchucking an passing out in a pile on the floor
A whiteout is when a man allows his penis to do all of his thinking for him. Akin to "blacking out" from being drunk, he may lose the ability to form coherent sentences, and begin communicating with offensively suggestive guttural sounds towards people.
The prevailing hypothesis suggests this is caused by a backlog of semen rushing to the cranium, soaking into the brain and impairing it's function. Once the whiteout is over, the man usually does not remember where he is, what he said, or what he did.
-Hey, why is Neal acting so aggressive and brash tonight?
-He must be having a whiteout because he saw a nice pair of jugs. We should issue a warning to everyone in the area: Hide the women and children.
Someone is snorting cocaine out of your asshole when you are standing on your head with your legs spread. When the person tries to snort the cocaine out of your asshole, you fart and blow the cocaine in their face. Causing a whiteout.