Rectal defilade

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."