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'.
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-
Bill : Oh Yeah, I remember her
James : I wish I was there.
Originally used by Youtube comedian and celebrity Toby "Tobuscus" Turner.
B: Dude I totally don't suck at aiming.