Top Definition
The condition of extreme intoxication, usually unintentional, during normal business hours. Day-drunk usually manifests as a dawning realization, and can result from attending a weekday sporting event or a lunch where a "couple of drinks" got out of hand.
When I finally hit the freeway from the stadium parking lot I realized I was day-drunk and had to cover one eye to stay in my lane. Dude, I was sweating, and not just from the sun.

Dammit, that's the last time I take vodka in a water bottle to a BYOB party . I accidently made a glass of Alka-Selzer with it the next morning and ended up day-drunk right out of the gate! I had to call in sick.
by sushibar April 22, 2007
To experience the effects of consuming large amounts of alcohol when none has actually been consumed.

Generally brought on by lack of sleep
Jim: Hey Jerry what's up with you? you're stumbling around, slurring your words, have your been drinking?

Jerry: Nah man, just a little day drunk
by Carter H April 21, 2008
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