The term unfacebookable refers to any situation, information, piece of data, picture, or the likes, that should never find its way to any social networking site (like facebook, twitter, MySpace, and so on). Ususally agreed upon while being at or after having attended a crazy party with lots of ... action.
J: "Last night, that party was off da chain, dude!"
M: "Yeah, you should see all those pictures - they are totally unfacebookable! Them people was wildin' out there - dirty dancing, making out on the dancefloor, downright foreplaying... like I said: totally unfacebookable pictures!"
An absolute terror of a comeback that destroys any argument with nuclear explosions, both hypothetical and real. The power level of this phrase trumps even that of the ancient "no u", for the opponent's opinion is left in limbo and their existence is made a lie. Use only in emergencies or when attempting to end a "no u" war.
Jeff: ur mom gay Mike: no u
Jeff: no u
Mike: haha ur face
*Jeff explodes in an instant and is sent to hell, where Satan himself summons him and utters the phrase "ur family tree LGBT", causing Jeff's pain to multiply exponentially as he is spun in a circle as a bunch of gay people slap his ass and continue to pelt "ur mom gay" at him