I don't shit a fuck

From Cyanide and Happiness, this rendition of 'I don't give a fuck' is made more epic shit. Used when you want to really show someone you don't even give a flying fuck what they think.

A: I got a new phone
B: Shut up
A: It's twice as-
B: I don't shit a fuck!
A: But the processor
B: NOOOOOOOOOOOOOOOOOOOOOOO