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.