The state or condition of having something up your ass. Most often used in reference to the location of a stupid person's head.

Origins: The term "defilade" is used in military tactics to refer to a position where natural surroundings protect units, vehicles or equipment from enemy fire.
Sgt. Slaughter: "Private Pile might be the stupidest person in this company. His head is so far in rectal defilade that he can see his own teeth."
by The Afterworld Cafe June 23, 2009
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