Top Definition
After a male ejaculation, and your pee comes out in two different streams, you must make the ultimate decision: which stream will go in the toilet?

The worst is when the most powerful stream changes to the least powerful and you are suddenly powerwashing your wall with piss.
I had a Niagra Fails today at the toilet, the worst part was it's my grandma's.

Niagra Fails just flooded your bathroom.
by StickyFingersINyourMOM August 11, 2011

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