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The morning after a late night; characterized by a wet toothbrush because you brushed your teeth just a few hours ago when you went to bed. Not necessarily but usually waking up for work after a late night of drinking.
Adam: You look like hell. Did you even sleep between the party and work this morning?

Justin: Yeah but it was a wet toothbrush morning.
by Guy Snyder September 15, 2014
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