tinfoil hatter

plural tinfoil hatters · alternative tinfoil-hatter

1. derogatoryslangA person who believes in or propagates conspiracy theories; a conspiracy theorist.

   She doesn't know whom to believe, but she agrees with the tinfoil hatters about one thing: Something is weird here.

   2014, Alaya Dawn Johnson, Love Is the Drug, Arthur A. Levine Books, published 2014, →ISBN

   2 more examples

   The Washington State Dental Association is backing his $300,000 pro-fluoride campaign. Danelle Weaver and her friends, meanwhile, have raised less than $10,000. But they are undaunted. "People think we are tinfoil hatters," says Weaver, "but we're just average families who take the time to research and want what's best for our children."

   2005 October 17, Margot Roosevelt, “Not in My Water Supply”, in Time

   We then tell the public and get laughed at and called crazy tinfoil hatters and then it happens just as we said it would.

   2012, Roger Bouwman, 99 Days, Lulu.com, published 2012, →ISBN, page 11