1. A maneuver performed by a unit of Internet denizens in response to an overwhelming onslaught of ignorance. The maneuver involves each member of the unit performing a standard facepalm in unison. Executed properly, the tactical facepalm is the only known defense against spontaneous cerebrofulmination—also known as "exploding head syndrome" (EHS)—resulting from exposure to extreme stupidity.
Forum dweller CO: Squad, initiate tactical facepalm!
Forum dwellers: Sir, yes, sir! *facepalm*
Forum dweller XO: EHS averted, sir!