an idea or concept that shakes one's previously held beliefs or assumptions about the nature of reality.

To experience a situation which calls into question the way your mind currently sees a certain idea or the world in general. Such an experience usually leaves the person stunned/speechless while he/she begins wrapping his/her mind around the new idea.

Something that seriously fucks with your brain, such as watching Fight Club every night for a week. Trust me on this.

to forcibly expose a person to an idea or lesson that leaves he or she, dazed and awestruck, to go through a bout of depression that lasts a variable amount of time in which they question existence, religion, and what they themselves would do in hypothetical situations. Usually the said person will ponder these questions at all hours of the night because they can not sleep and will end up finding only a few answers/revelations. Once of which may include that "if" is the most evil word in the English language. Eventually he or she recovers & usually feels a mixture of a hate & love toward the mind-fucker. Hate for their mental/emotional anguish and love for the perspective they gained and the lesson they learned.

An image that totally fucks with your mind. When you see it, you will shit bricks.

Mindfuck: v. The act of completely amazing someone to the point of confusion and speechlessness

Mindfucker: n. Someone who destroys all sense of reality.

A process of raping your intelligence; never accompanied by a pre-lubricant; doesn't leave you with an endorphine high and craving a peanutbutter and jelly sandwich or a cigarette. Rarely are dinner and drinks bought for you before or after the act; most often tried on an unsuspecting victim,penetration has less friction; the perpetrator will rarely call you the next day; A passive-agressive way to get their money shot, no happy ending for you.