Doing something that causes you not only to shit your pants, but also to piss, vomit, cum, spit, and bleed into your pants.
person 1: Hey did you see how steep that double black diamond was?
person 2: yeah, it caused me a fluid nightmare.
person 2: yeah, it caused me a fluid nightmare.
by wooden man May 10, 2012
Get the Fluid Nightmaremug.