Inter-office mail that shows up out of nowhere. It just magically appears in your inbox and you have no idea who left it.
by badandy519 August 25, 2009
Get the ninja mailmug. Ninja is a phrase now used to label a person you do dirt with. It's roots are found from the actual Ninjas who would move in the darkness of the night, never being seen, veiled in mystery, also usually committing crimes as Ninjas were actually farmers who rebelled against the Samurais who were rich men, soldiers, and basically part of the Govt. Now the phrase is used more commonly to friends who you may be committing crimes with and crimes usually happen at night. If you commit a burglary then those affiliated with you could be called your ninjas. Of course, a lot of people just want to sound cool and use the phrase though never committed any crimes in their actual life. So the phrase has also become just another word similar to words and phrases like homey, homeboy and nigga.
by PrettyBoy91 October 25, 2012
Get the Ninjamug. by TheGingeyy November 4, 2017
Get the Ninja Dickmug. by MrKhakis November 22, 2018
Get the Ninjamug. Word describing anything relating to, but not limited to, the most legendary warrior of all time. His name is unknown, but he is said to prestently reside in Livermore, California. The only clue of this legendary warrior that has been found are the letter, "T" and and word, "Beastman".
"That guy is so legendary. It's like he is truly a ninja."
"Sleep with one eye open, or the ninja will get you."
"Sleep with one eye open, or the ninja will get you."
by Silent Prophet January 30, 2010
Get the Ninjamug.