Like a Demon 

To do something in the extreme. Especially, to do something extremely well, or extremely fast.

She drove like a demon to get us to the deal on time.
Take a holiday, you've been making sales like a demon this week.

Like a Demon by Dave Pinkerton July 20, 2008

shitting like a demon

1.)Defecating in a violent, uncontrollable manner that upon completion leaves one feeling weakened, unstable on their feet, and possibly light headed.

2.)Taking a devilish delight in defecating including, but not limited to: turning and looking upon the feces (hopefully located in a toilet bowl) with disgust and satisfaction; hoping the person in the next stall is gagging on the resulting stench; and loudly emitting moans or grunts that could be taken for either pleasure or pain by those close enough to overhear.

I need to sit down for a minute because I just finished shitting like a demon and now I'm dizzy.

shitting like a demon by EmaHumongous305 May 18, 2011