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Temporary lapse of memory/mental fogginess/amnesia often due to excessive alcohol use. Not to be confused with blackout, as a greyout occurs for short intervals between one and five minutes.
Al: So you drunk texted me 30 times yesterday
Amber: What!? I don't remember that...
Al: So basically you blacked out?
Amber: Nah, I remember everything except for like 5 minutes of last night.
Al: I guess you must have had a greyout!
Amber: Sweet!
by hthund February 10, 2013
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Aug 11 Word of the Day
You can tell by the way she walks, she got that WAP.

You can look at her face and tell she ain't got that WAP.
by Black Don August 06, 2020
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A alcohol induced midday state simliar to the blackout only due to it occurring midday, the sunlight turns the black to grey.
Sally is such a trainwreck, she spends her Sunday mornings at brunch getting greyout in order to make her drunken behavior acceptable.
by DrewNLax September 03, 2007
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