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3.
a) A sign that is put on the outside of a business premesis that is indicating that it is temporarily non functional, and that business will resume within the hour.

b) not paying attention.
Out to lunch, back at one.


He's out to lunch.
by Kung-Fu Jesus April 18, 2004
 
1.
not paying attention/ dazed off
"You're out to lunch"
by jdg November 17, 2003
 
2.
Drunk, intoxicated, plastered, wasted, etc.
"My friend was out to lunch when he jumped off the roof."
by gorillagrip June 21, 2006
 
4.
The away message you get on instant messaging services like AIM when your friend is eating his girlfriend.
Guy 1: Hey Guy 2, what's up?
-Auto Response from Guy 2- Out To Lunch.
Guy 1: Again...?
by Pantho May 12, 2009
 
5.
Techincally speaking, when a piece of network equipment goes down.
"The server just went out-to-lunch; what a piece of shit."
by Network Director September 16, 2013
 
6.
Going OUT of the room and meeting your co-worker in the closet, TO LUNCH down on her sweet spot.
I love taking Angela OUT TO LUNCH, I could eat all day long with her.
by huffinthemuffin December 16, 2010
 
7.
something your supervisor usually is.
Hey man, have you seen the sup lately?
No man I think he's out to lunch!
He's out to lunch period.
by Jeff Barouch July 12, 2004