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1.
When one has a massive need to take a dump, but upon arrival at the toilet. The need goes away.
I had a poop sneeze.
by Tdolph December 01, 2010
 
2.
When one lets out a little sneeze and poops. Also can be called a bean sneeze. When you snizzle so hard your beans strain and piddle comes out so fast it hurts.
(On the balcony of the resaurant in Scottsdale AZ)

P: " Theres poop on my finger"
A: "What? Poop sneeze?"
by spidertots August 19, 2011