based on the idea that tin foil protects your brain from being read, this term may also refer to people who embrace paranoid or conspiracy theories. especially used by leftists when referring to far leftists.
Did you see the Tin Foil Hat ranting about aliens controlling the media? His conspiracy theories made the rest of us look like nuts!
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!
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.
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.