What is Tinfoil Hat?
1.
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!
2.
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.
3.
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!
See
4.
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?"
5.
something the kids wear in the movie "Signs"
"so the aliens can't read our minds"