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.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi