Describes a mate or partner that has perfected his craft through years of seeming like a great catch when in all actuality...he suddenly, and stealthily reveals himself as a complete douche bag.
Great husband and family man...and poof, the douche ninja comes out of nowhere and reveals that he is a cheating, lying scumbag. You had no idea. Surprise attack. Many victims.
by Sonny James August 29, 2013
Get the Douche Ninjamug. A Time Ninja is a person whos asks questions about a service and has no intentions of spending a dime with you on any of the services you just spent 30 min explaining.
Hello buddy how much is my air filter coolant flush and trans fluid exchange! Well sir it runs 300 dollars! Thank you buddy this is a great price! ok sir we can take care of this right away. Ok buddy go ahead and check them and ill come back another day! thank you for wasting my time ninja
by seawizz October 9, 2013
Get the time ninjamug. In RPGs and some MMORPgs, is another word for a character that can be in the forefront of the battle and survive the outcome due to sheer evasiveness rather than high armor and health. An example would be the assassin from the pseudo-MMORPG game "Guild Wars", especially in PvP mode.
by BinaryEmperor August 18, 2008
Get the Ninja Tankmug. A person who occupies a bathroom stall and refuses to make any BM noises until the entire bathroom has been vacated. Occasionally, a bathroom ninja will even go so far as to stand on the toilet seat to avoid detection by other bathroom-goers.
Jacob hid in the shadows cast by the stall walls like a bathroom ninja until the final shitter had left the restroom.
by timr211 August 15, 2014
Get the bathroom ninjamug. The one person you always try to,avoid at the bar but he somehow seems to show up out of nowhere and spews his drunk stupidity at you.
My girlfriend and I were having a great time at the bar last night and out of nowhere Pat appears , completely drunk , talking about his latest female conquest. He is such a fucking Alcoholic Ninja!
by Urban humor May 27, 2017
Get the Alcoholic Ninjamug. by TurboTurbo January 10, 2011
Get the Door-Ninjamug. Usually played on guitar, but just the same on piano, this is a series of notes that requires the player to stretch their hands out as far as humanly possible.
by Matt Wrong April 20, 2011
Get the Ninja Chordmug.