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.