A term
coined by Tobuscus (See Tobuscus), a
famous Youtuber, most popularly known for his literal trailers and facebook commercials.
One of his many Youtube accounts, TobyGames, features his commentary on whatever game he is playing at the time.
Term is usually used when taunting an ememy. Usually when being an idiot. It can be translated as another word for 'Mother Fucker'.
Toby: -opens door, where there is potentially a demon- WHAT'S UP, MOSUCKRA?
Demon: -angrily chases after him, eventually killing him-
Toby: -finishes a goal in game- THAT'S WHAT I'M TALKIN' 'BOUT, MOSUCKRA!
Demon: -growls angrily-
Toby: -hides in a dark corner-