Derived from Donald Rumsfeld, erstwhile SECDEF and all-around meanie, the term "rumsfeldian" is an adjective used to describe a truly tremendous blunder, such as NOT pursuing the jihadis in Afghanistan or invading/occupying a hostile country with far too few troops.
"We have known knowns(things we know we know), known unknowns(things we know we don't know), unknown unknowns (things we don't know we don't know), and unknown knowns (things we don't know we know)" came the rumsfeldian reply to the reporters question.
The act of being close in nature, or complete opposite, to former United States Congressman, Secretary of State, and Secretary of Defense (1975 to 1977, et al. 2001 to 2006) Donald Rumsfeld.