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Someone who sneaks into a residence in which the dweller lives by themself, then deficates in their toilet leaving no visable toilet paper and then does not flush.
Jessie got home to her apartment after a long day at work. She stepped into the bathroom to take a shower when she spotted the foreign monster in the toilet bowl... she knew then the brown ninja had struck again.
by dsackaroo January 23, 2013
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2
leaving a foul oder, usually in the form of a sbd fart for someone to walk into, unsuspectingly.
I just left a brown ninja for jeremy to walk into.
by rossta January 26, 2005
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