Humorous euphemism used to explain the (how shall we say this nicely...) ritualistic non-surgical dislocation of the head from the torso. It's becoming a useful term when attempting to relate to the antics of certain deranged individuals in the mideast who are mired in 9th century mentality.
(person 1)"Did you hear about those hostages in Iraq? Can you believe they..."
(person 2 interrupts) "..yeah I heard... they got the islamic Haircut."
(person 1 shaking head in disbelief)"I thought that was the great peaceful religion...."