A term for utter Nonsense, people exclaim this when they are
angry because something
strange or something that defies all
logic or physics, could also be for something that is nearly impossible to acheive.
Joshua: Hey dude I just got all the Achievements on Metal Gear Solid.
Nathan: Bullshit!
Joshua: No seriously, I really di-
Nathan: BULLSHIT!
Joshua: Dude, if you can't even trust me than why am I even you're frie-
Nathan: I SAID MOTHERFUCKING BULLSHIT!
Joshua: Fuck this Shit I'm out.