1) Posting or commentating on Facebook when under the influence of alcohol or in a highly emotional state. Upon sobering or waking you wonder if you did log onto facebook whilst under the influence. Then it dawns on you & you reap the nightmarish/highly embarrassing effects of your actions or lack of tact.
2) Having someone else posting, commenting or associating you with something on Facebook that results in the above nightmare situation.
I've had a Facemare, I gotwasted last night & posted what I really think of my boss & co workers!
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).