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1.
Commonly misused to mean online, ie from the internet, when, in fact, they mean the exact opposite.
I bought my new computer offline.
I met my boyfriend offline.
by Neil Roberts April 05, 2005
 
2.
What you are not right now.
Right now you are, obviously, not offline.
by Lol_idk June 06, 2009
 
3.
Used in business to describe communication outside of the normal channel, or defered to a later time.
Durind a discussion with a large group of people, an issue may be "taken offline" so that it can be discussed by a smaller group of people at a later time.
During a conference call: “This discussion doesn't pertain to everyone here, you and I can take it offline.”
by nickadfghjkl October 22, 2008
 
4.
The act of signing offline immediately upon being sent an instant message by someone you don't want to talk to. This can also be done abruptly in the middle of a convo as if to say "piss off, I'm done".
Dude #1: "Yo, that really annoying chick is IMing me again! what should i say?"

Dude #2: "Nothing, Offline the bitch"
by Sir Edward Heavypants August 13, 2009
 
5.
A person who has no idea about anything and has never tried to understand.

Person says:
I tried to tell him how to work the computer but he plainly refused. He thinks its too hard. He's offline.

by VICKI KARMA November 10, 2006
 
6.
A question that could have been answered by the person asking it, had they've asked themselves first.

Both the question is offline and the person!
(person1)
What time is it?

(person2)
Um...What's that thing your wearing on your wrist, a watch or a ticking time bomb!!

(person1)
I forgot i was wearing it...sorry i was offline for a second then. Im back on now though.
by VICKI KARMA November 10, 2006
 
7.
Business Buzzword term most commonly used during a meeting when one person would like to discuss something one-on-one after the meeting.
Paula: I can leverage this report to give you a ballpark guestimate
Steve: We'll take this off-line Paula. Anyone have any more synergy?
John: I thought I had but then I realised it was a paradigm. Any use?
by thepreacher May 15, 2006