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1.
Pulling up ones shirt over ones nose while using a toilet facility to avoid the smell of the previous user
Jason walks into the bathroom after adam has shit and thinks "GODDAM THIS TOILET FUCKEN STINKS, TIME TO DO THE OLD STINK NINJA" pulling his shirt up over his nose and thus finds urinating at work bearable once more. True story
by raymonty January 15, 2012
 
2.
A derogatory term used by women to describe sexual partners who have attempted anal intercourse without previously discussion.
Mary: I went out with paul last night (sigh)
Jane: Paul, you should have talked to me first. He's a stink ninja.
Mary: You got that right. I won't shit right for a week.
by Micro67 May 15, 2010