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1.
sunday night, monday, tuesday, wednesday, thursday, monday morning.

A day of the week when you generally don't get drunk....

Exeptions include new years eve
Idiot: Wanna drink up?
Dubs: I got work tomorrow, and its a weekday... idiot...
by DUBS January 15, 2004
 
2.
Used to describe a person, thing, or event as homosexual, so as to avoid use of the words "gay" or "fag."
"That jacket with those jeans is soooo weekday, but for a straight guy you totally pull it off."

"If I didn't know any better, I'd say he's a weekday."
"Yeah, I heard he was flirting with Danny last night at a party."
by Broclee June 28, 2008