A blanket term for "birthers", "truthers" or "deathers" Reality is too uncomfortable for them, so they start to believe in strange conspiracies.
I can't believe that he thinks that Osama Bin Laden is still alive. He's definitely reality challenged
May 29, 2011 Urban Word of the Day
(adj.) being in a state in which one is utterly and completely unable to distinguish fact from fiction, and is thus obviously and undeniably full of shit.
Most politicians are reality challenged. So are a number of attorneys, as well as most people living in Hollywood.
To use it in a sentence: "That guy is SO reality challenged... that he can't even tell shit from Shinola!"