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A person who occupies a bathroom stall and refuses to make any BM noises until the entire bathroom has been vacated. Occasionally, a bathroom ninja will even go so far as to stand on the toilet seat to avoid detection by other bathroom-goers.
Jacob hid in the shadows cast by the stall walls like a bathroom ninja until the final shitter had left the restroom.
by timr21 August 15, 2014
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–noun, plural -ninjas.
a person who sneaks into restaurant, retail store, or quick mart for the soul reason of using the restroom and doesn't make a purchase.
Manager: Did that gentleman buy anything?
Cashier: No, he was just a bathroom ninja.
by lookslikelolita August 01, 2008
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