An unproven theory, thought or idea that often has a large amount of evidence pointing contrary, usually used in a form of humor, satire or sarcasm. It is often used to convey in text messages the content is not to be taken seriously.
"I just bought a Birds Aren't Real Hoodie"
"That is some nice tinfoil."

"Christopher Columbus fell off the flat earth in 1492, and was reinstated in our history by aliens to keep us complacent in thinking the world was round *tinfoil intensifies*"
by Manabrave October 2, 2020
Get the tinfoil mug. in M. Night Shama-lama-ding-dong's movie Signs, the kids put tinfoil hats on their heads to protect them from the aliens.
R - I think Attorney General Eric Holder and Oprah's boyfriend Stedman Graham are the same person.

M - OMG...R's gone tinfoil on us
by Rebecca G March 3, 2009
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Quasi-mystical aluminium foil that (if worn in the ears) can filter out reception of most left and right wing chaff.
1st person: "You are both scum and an idiot and possibly traitorous if you do not think like me"

2nd person: "I'm not hearing you, I have my tinfoil hat on"
by G. Willikins April 28, 2005
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someone so ***out there***, that they wear tinfoil hats-- or perceive messages from their amalgam tooth fillings. its roots are from mental institution paranoia and has progressed to today's contemporary society.

Politically, this may be a derogatory comment towards conspiracy theorists and is akin to birthers and their ilk.
He's a real tinfoiler: he believes those stories that other ethnicities eat fetus baby soup-- just because it is on the 'Net.

She thinks the ants took her sunglasses from the picnic-- she's a tinfoiler.

Tinfoilers believe that the End of Days is nigh, because of who won the election.
by Mumsie Dogma October 11, 2009
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to be foiled or thwarted by tin.
Blast it! my scheme has been tinfoiled once again.
by Funkmaster Fred June 19, 2006
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To cover some gay persons stuff in tinfoil - normal you right 'owned' after on their pin board...
(@oS^fluX`) i tinfoiled all this boys stuff in his room
by Night` January 17, 2005
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a paranoid person, of the sort who believes in conspiracy theories (from the notion that such people wear tinfoil hats)
He is just a tinfoiler who can't understand rational thinking.
by The Return of Light Joker June 26, 2011
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