tin-foil hat

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See also: tinfoil hat


A sockpuppet with a tin-foil hat

Alternative forms[edit]

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tin-foil hat (plural tin-foil hats) (sometimes abbreviated TFH)

  1. A piece of headgear made from one or more sheets of tin foil, aluminium foil, or other similar material, the hats worn in the belief that they act to shield the brain from such influences as electromagnetic fields, or against mind control and/or mind reading