What is Out To Lunch?
1.
not paying attention/ dazed off
"You're out to lunch"
See
2.
Drunk, intoxicated, plastered, wasted, etc.
"My friend was out to lunch when he jumped off the roof."
See
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.
See
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...?
See
5.
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.
