Crossing the streams: When you're urinating and defecating at the same time, and you maneuver your body just right so you can urinate on your feces while it's coming out.
This isn't a sexual act, but I'm sure someone can figure out a way.
"Dude, I just pissed on my shit while it was still coming out. It was awesome!"
"Yeah man, I cross the streams all the time."
by GhostGuyGGG July 20, 2009
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What you tell two people peeing at urinals next to each other to save them from untimely death, in reference to crossing the streams in Ghostbusters.
by zipwolf June 27, 2006
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When something is as bad as Egon's explanation of crossing the streams from Ghost Busters:
"Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light."
"Right. That's bad."
by greatscott! April 1, 2009
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