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adj. - having characteristics in common with paranoid delusions. The word comes from paranoid people wearing tinfoil hats to keep the aliens from reading their mind, or to keep the Illuminati from using mind control rays on them, etc.
"You have to sign this petition! It's to get Congress to require all envelopes to be self-adhesive. When you lick an envelope flap, the Post Office runs it through a scanner that takes a DNA sample. Then they match that up with your name based on the return address. Homeland Security claims to be keeping the information to know how best to protect Americans from a gene-based terrorist attack, but if the wrong people came into power, they could use it for eugenics and put everyone with a certain chromosome combination into concentration camps! So will you sign the petition?"

"Um...I don't know, dude. Sounds a little tinfoily to me."
tinfoily by Gigglingwizard April 28, 2009
Related Words
Thursday is the new Friday.

When Fridays and weekends are busy, celebrate on Thursday. Don't wait for Friday, drink on Thursday like it's Friday...then again on Friday!

pron. "Tit-niff"
"We're going to the bar, wanna come?"
"On a Thursday?"
"Yeah! It's TITNF!"
".....?"
"Thursday is the new Friday, let's go!"
TITNF by Lookalemur April 13, 2022

tinfoil hat 

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!
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*"
tinfoil by Manabrave October 2, 2020

tinfoiler 

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.
tinfoiler by Mumsie Dogma October 11, 2009
A three-way contraction combining the words "it" "is" and "not".
mother: that's it, you're grounded for painting the dog purple!

kid: tisn't MY doing! My sister did it!
tisn't by GalaxyDancer April 17, 2005