T-shirts (or other clothing) that change colour according to how hot the wearer's body is. Popular in the 1990s. Failed invention due to fundamentally silly idea. See also midget cream.
Marc's T-shirt was made of global hypercolour. Then he went to prison.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi