Anything completely lacking in value, purpose, and lacking a positive contribution to the matter at hand. As 'bullshit' or 'b.s.' is usually used to denote something as meaningless or without practical value, stupid adds more derision. Can also be used in the sense of 'drama'
At work they set up this new way to handle orders, and Johan and me both think it's nothing but stupid bullshit, man.
Jerry's ex-old lady came over and started a bunch of stupid bullshit, man.