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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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Jun 5 Word of the Day
A pubic hair piece. A toupee for the pubic area/genitals. In the 1700’s when mercury was used to treat sexually transmitted diseases (Gonorrhea or Syphilis) one of the side effects was the loss of pubic hair. To disguise this condition, that was not cured by mercury, a Merkin was employed.
17th Century setting: Due to his treatment of the "French Pox" (syphilis) with mercury a merkin Gwendolyn used a Merkin to used to hide the side effects of hair loss and not alarm her husband.
by David W. Tuthill December 30, 2005
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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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3
LEGO™ Man: “Hey have you heard that the Brown Ninja sacrificed Kai to Satan?”

LEGO™ Man 2: “Yeah, sadly they didn't get along since Brown Ninja was a god.”
by PseudonymDefinitionPleaseOrDie September 14, 2019
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