Top Definition
Number 1 fashion accessory for unemployed conspiracy theorists around the world!
The illuminati was scanning my brain, but not since I got this tinfoil hat!
by Bas April 08, 2005

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Propoganda designed to cover up a massive government conspiracy. Begining in the late 1970's, the United States government tried to cover up its radio-wave thought-control program by circulating a false rumor that people could shield their minds from government intrusion by wearing a tinfoil hat. In truth, a tinfoil hat only improves reception and makes it easier for the government to read your mind. Speak truth to power!
Take off that tinfoil hat, you fool, the black helicopters are coming!
by Shep Pettibone May 22, 2009

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Derisive attempt on behalf of blind conformists to discredit and stigmatise those who dare to question authority.
"You honestly believe the war is all about oil? Where's your tinfoil hat?"
by Cara_Drina July 01, 2005

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The special properties of aluminum foil that shield the brain from being read by "liberal activist" scientists. Also works nicely as a rain hat that gives the "tin roof" effect.
Dick Cheney hated getting wet for it faded his outer humanoid membrane. He discovered the tin foil hat he wore from his "undisclosed location" kept him warm and toasty.
by Wisk January 30, 2008

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1. A hat made from kitchen aluminum foil or other pliable metallic substance, with the supposed purpose of shielding the wearer's brain from mind control/surveillance by various supernatural or conspirital organizations.

2. Pertaining to various supernatural or conspirital phenomena.
Mike is still talking about space aliens? He must have left his tinfoil hat at home.
by 1Spectre4U August 12, 2003

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Tin Foil Hat, also tinfoil hat, or tfh, a general term for a piece of headgear made from one or more sheets of tin foil, aluminium foil, or other similar material. Some people wear the hats in the belief that they act to shield the brain from such influences as electromagnetic fields, or against mind control and/or mind reading. The concept has become a popular stereotype and term of derision; in Internet culture, the phrase serves as a byword for paranoia.
that guy is so paraniod he needs a tin foil hat.
by bkdouble October 05, 2006

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alien technology that make people crazy. once removed from head will have a million uses. it often seen on a head of a man/woman who appears insane. again it has a million uses such as heating a potato getting a tan and if turned inside out can cool you down on a hot day
"hey my potato's cold"

"here use my tin foil hat it should heat it up in no time"
"thanks"
by chris cooper alabama April 23, 2010

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