Mocking term for espousing debunked conspiracy theories. Referencing those whose tenuous grasp on reality has led them to wearing self-fashioned tin foil hats in public -as a safety precaution against "x-ray waves" from aliens, communists, the government, Rosie O'Donnell, etc. Often used in reference to 9/11 theories and people that treat the DaVinci Code as non-fiction (tinfoilhatters, if you must)
"After reviewing these facts, maybe it can be seen that "loose change" etc. etc. is so much glorified tinfoilhattery."