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1.
Where your mind is at.
"I'm not in the right headspace".
by Mathilde P. September 26, 2006
 
2.
A particular frame of mind or worldview that is relative to and/or distinguished from that of others
Example one:
When I need to find my own headspace, I go and write my blog, cook one of my favorite foods, or dance to a favorite song. No one and no thing can bother me then.

Example two:
John says: My boss micromanages me so much, even beyond simple work details, that I have little headspace at the end of the day.
by Z Last Words October 02, 2009
 
3.
The state of mind/consciousness you are in. It may or may not be an altered frame of mind.
After that bad acid trip, Jim's not in a good fuckin' head space. He's running down the street, naked, screaming Lynyrd Skynyrd's Free Bird lyrics at the top of his damn lungs.

Not being a morning person, my head space is like London fog in a room full of sharp objects when waking up. Coffee is the only remedy. Two pots worth. 1000 mg of Caffeine to be precise. And a line of yayo.
by Zaerthe November 05, 2010
 
4.
The projected realm inside the mind, where individual headmates may be able to interact with each other and even potentially carry out a day-to-day life separate from the world outside the system’s body (i.e. “real world”).

This phenomena occurs when there is a system of personalities operating within the mind/brain/body. This is often called a multiplicity or Multiple Systems

A multiplicity is a state in which many people share one physical body. Being multiple means that one exists as part of a group of people, with all the benefits and drawbacks and chances for talents or interesting natures that any other group of people would have.

It is not automatically a disorder, and it is not automatically something which must be changed in order to promote mental or physical health. It is not automatic godhood, proof of genius status, or even proof of severe sexual trauma
Don't mind us we are just redecorating our headspace
by psuedon April 07, 2013
 
5.
Another Bullshit term that wannabie managers use to try and sound smarter then they really are, when they are really trying to say "I dont like your attitude".
I've called this meeting to get a better handle on your current headspace
by Bullshitfree August 08, 2011