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1.
The third eye (also known as the inner eye) is a mystical and esoteric concept referring in part to the ajna (brow) chakra in certain Eastern and Western spiritual traditions. It is also spoken of as the gate that leads within to inner realms and spaces of higher consciousness. In New Age spirituality, the third eye may alternately symbolize a state of enlightenment or the evocation of mental images having deeply-personal spiritual or psychological significance. The third eye is often associated with visions, clairvoyance (which includes the ability to observe chakras and auras), precognition, and out-of-body experiences, and people who have allegedly developed the capacity to utilize their third eyes are sometimes known as seers.
In Hinduism and Buddhism, the third eye is a symbol of enlightenment (moksha and nirvana). In the Indian tradition, it is referred to as the gyananakashu, the eye of knowledge, which is the seat of the 'teacher inside' or antar-guru. The third eye is the ajna chakra (sixth chakra) also known as brow chakra or brow centre. This is commonly denoted in Indian and East Asian iconography with a dot, eye or mark on the forehead of deities or enlightened beings, such as Shiva, Buddha, or any number of yogis, sages and bodhisattvas. This symbol is called the "Third Eye" or "Eye of Wisdom," or, in Buddhism, the urna. In Hinduism, it is believed that the opening of Shiva's third eye causes the eventual destruction of the physical universe.
by Paul Wall Da People's Champ December 02, 2009
 
2.
The metaphorical extra 'eye' that allows for higher perception. It is theorized that the Pineal gland is responsible for this extrasensory perception. The third eye is a metaphor for higher consciousness, the ability to see through the common facade; to be able to perceive the truth beneath.
Squeegee your Third Eye clean!
by Juan A. Bizkit September 18, 2003
 
3.
The mind's eye, views the world not by light of colour, but by light of reason.
See: Bill Hicks
"Watching TV is like taking black paint to your third eye"
by Brewdles April 01, 2003
 
4.
A metaphorical "eye". Attributed to ESP, precognition (seeing the future), etc. In yoga, it is the Ajna Chakra located in your forehead abotu 1/2 inch above and between your eyes. In Exo-Psychology, it is the 6th brain, defined as "the nervous system becoming aware of itself apart from imprinted gravitational reality-maps". Basically that means that it is the point where the brain is aware of itself programming itself.

See metaprogramming
Thanks to peyote and LSD, i was able to pry open my 3rd eye
by electroshaman July 06, 2004
 
5.
A huge fan of all things Metal and Rock, with a small dosage of Punk on the side.
"Who's the biggest Kiss fan out there? ThirdeYe!"
by ThirdeYe June 06, 2004
 
6.
A big bump in the middle of your forhead
Her acne is so bad that she has a third eye
by Bozzy446 April 26, 2013
 
7.
An Anus Or bumhole, it cries solid brown tears.
Mr. Ellis likes Tims Third Eye
by Jimmy Carter July 13, 2005