An utterly foolish and obnoxious person who is so incurably self-righteous in his/her beliefs that he/she will go to any extent to defend them irrespective of whether they are right or grossly wrong.
by killerdove October 27, 2015
Taken from the christmas movie 'Elf'. A 'Cotton Headed Ninny Muggins was one of the lowest forms of insult, it's meant to cause offence. A term adapted to 21st century language.
by Jojo92 December 12, 2011