tin hat

tin hat (plural tin hats)

1. (military, slang, historical) The steel helmet worn by soldiers during World War I. [from 1915]

   Synonym: trench derby (slang)

   • 2007, Winston Groom, 1942: The Year That Tried Men's Souls:

     They could live on jerked goat, the strong black coffee they called 'boiler compound,' and hash cooked in a tin hat.

2. A tinfoil hat.
   • 2011, Andrew Curtiss, 1984 Redux: Say Hello to Big Brother, page 491:

     The New World Order is a term that has often been laughed at, ridiculed and considered as paranoia by tin hat wearing conspiracy theorists in recent history.

   • 2011, Carol Ann Lindsay, The Planet Of Comet Sense, page 102:

     Meanwhile we're all being led like sheep to the slaughter while being portrayed by the industry that would commit genocide as a fringe group of misguided, uninformed, conspiracy theorist, tin hat lunatics that also believe in alien abductions.

   • 2018, Alex Oates, “Rules for Being a Man”, in Silk Road (How to Buy Drugs Online) and Rules for Being a Man‎, Bloomsbury, page 38:

     I don’t look like a conspiracy theorist. No tin hat, right?

• “tin hat”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.

• Tanith, in that