Acts of vandalism, mischief, juvenile behavior, pranks and various misdeeds. Usually the perpetrator of these acts can later be referred to as "_____, that motherfucker...". Motherfuckery in this sense is typically committed by a person who finds these deeds to be humorous.
Pantsing fat kyle and then hitting him in the crotch with a pie, so he can't pull his pants up afterwards, would be the best motherfuckery this shitty city has ever seen.
A person who dodges anything constantly, e.g. people, plans, relationships, commitments, etc., typically with a flimsy or no excuse. Can also be an alternate spelling of "motherfucker" for cellphone users who refuse to upgrade to modern mobile devices. Variants include: Adj. - motherducking, V.- motherducked
She never returns your calls either? That motherducker's gonnalose friends if she doesn't reciprocate.
To make Motherfucking Money is to make enough money that when you tell colleagues of equal level your salary, they say "... motherfucker" in disbelief and jealousy.
Tom "Yo, tony, how much money do you make a year"
Mr. Anthony "I dont know if you'd wanna know"
Tom "come on, tell me"
Mr. Anthony "I make a 3 million dollars a year"
Tom, who makes 80k a year says ".... motherfucker"