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1.
A person who is unbelievably quite when using a restroom.
Hey man, have you ever notiched how Zack is total toilet ninja?
by PhilipSkovgaard April 01, 2009
 
2.
Mainly corporate personell who go to great lengths at avoiding being seen taking a crap at the workplace toilet
" Hey Bob I felt something whiz by me while I was taking a piss, weird"
"Oh that was most likely Phil, he doesn't like people seeing come out of the crapper, he's a toilet Ninja"
by The Firezombie July 10, 2008
 
3.
When a criminal tries to dispense of evidence in a restroom, this same-sex modern-day hero follows the offender and physically prevents any further crimes.
This lady was caught shoplifting and, in a panic, ran into the restroom to try and "flush" the evidence, but Katy, the same-sex security guard, and modern-day hero, followed the alleged criminal into the stall, secured the prisoner, and saved the day. Katy is a toilet ninja.
by carolinatdi June 13, 2011
 
4.
Someone who makes it to the toilet just before you do
'I was going to to toilet and just as I got to the door, Jack rushed in before me!'

'Ah Jacks a Toilet Ninja'
by sn8f1st August 12, 2008