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1.
A sarcastic spin on the common phrase. It is what you tell someone when they get in your way or are making you unhappy. It was originated by Bon Jovi in 2005, and coincides with the red, box-shaped, smirk...a spin on the popular yellow smiley face.
"When the world gets in my face, I say...Have a Nice Day!!"
by acb November 14, 2005
 
2.
When used in Brittain, this phrase actually means "Fuck You"
Have a nice day! *followed by the up yours two fingers*
by laladoodida July 16, 2008
 
3.
The phrase used by help desk, retail, and other customer service workers all across America when they'd like to tell the person they are speaking to to sit on a large object and spin, but enjoy maintaining an income.
Customer: I can't get onto the internet.
Help Desk: Okay, can you please check to make sure the cables are securely connected from the wall to the modem?
Customer: I can't see.
Help Desk: Why not.
Custoemr: The power is off.
Help Desk: Oh, unfortunately, you're not going to be able to connect while the power is out. Call back if you need anything. Have a nice day.
by Xodusprime March 18, 2008
 
4.
the catchphrase used by mick foley's late 90's persona mankind
after mick came to vist mr.mcmanhon in the hospital he told vince to have a nice day
by anthony keiser August 31, 2006