A loss of all that one makes out to be reality.
Mentally questioning reality, for what it is.
Another world of reasoning.
Usualy experenced by hallucinogenic drugs, either Mushrooms (Psychobilin), Acid (LSD, 2C-I, 2C-E-B, etc etc) or trauma to the brain
It is the loss of apparent truths, and what MUST be taken as truth.
Sigmund Frued coined the word "Ego", he had something in mind that was far away from how the word is tossed about today.
As he classified, it is the epitimy one of the three mental states (Id, Ego, and the Superego) The Id being the primal area of consciousness, devloped as a child, only caring about itself and how to gratify any desire it has. (A baby crying, an infant screaming "MINE!" about things it's never seen before)
Out of the Id, the Ego grows as a person gets older. The Ego is how a normal "of age" human acts and thinks in everyday life, but it is based soley off of the Id, because the Id was the first state of consciousness to take in any information at all from the outside world. The Ego is not so selfishly seeking and recognizes that there is a larger picture, a world aside of itself; the Ego acts as censor to the Id, stopping and keeping in check the primitive desires for instand gratification, recognizing the larger picture, so to speak.
The final state of mental maturity is the Superego. The Superego is the highest state at which we have arrived in our evolutionary "progress." The Superego is an overseer, our conscience; and, like the Id, is something of which we are not conscious, not aware of at even the slightest, but is always present in thought.
It is a loss of the Ego and the ID, It is the Superego (An understanding of the world around you and what SHOULD be happening) lost by itself, with no previous truths to go off of.
Without these apparent truths one is taught in life, a person enters a state of absolute disbeleif.
it can sometimes be seen as a state of total confusion, not knowing why anything happens, why it should, or why you feel the need to want it to or not.
Usually occuring during an intense trip, seeming like it is the only answer and it will be how you live the rest of your life, but usually forgotten by the time one wakes up, not much unlike being in the mode.
"Man, I had such a bad ego loss I realized I was nothing, or wait, was it that I was, but there was no reason for anything? uh.. ah.. Maybe it was that I don't know why I do anything?, Hell, I dunno anymore."