A Ninja Typo is a punctuation or grammatical error that does not reveal itself to the author (no matter how hard the author looks for it) until it is too late (i.e. after it has been published in a way that cannot be retracted).
Example : Dang! I proofread this email 3 times and I STILL managed to leave the "l" out of "turtle". That Ninja Typo just killed my chances of getting re-elected.
by Mank002 October 22, 2014
Get the Ninja Typomug. Girl 1: How are you feeling?
Girl 2: Much better since I took a shit in your studio apartment, thank you.
Girl 1: Wow, I had no idea. Gold throwing star, Ninja pooper.
Girl 2: Much better since I took a shit in your studio apartment, thank you.
Girl 1: Wow, I had no idea. Gold throwing star, Ninja pooper.
by newsvava February 21, 2009
Get the Ninja poopermug. a mystical being able to transcend in and out of buildings, rooms, houses, social groups and even multiple dimensions, Usually under the influence of alcohol to the point of memory loss
by Dancingdanshittingsand October 29, 2012
Get the drunken ninjamug. After a sporting event; when your teammate is washing his hair and his eyes are closed, someone sneaks up behind him and checks his oil with their thumb (quickly slips a thumb in his ass), then runs off before he is able to rinse the soap away and identify the clandestine violator
After the game someone gave John a rusty ninja. John was attacked by a rusty ninja after the game. Be careful, there's a rusty ninja in there.
by sandy_x December 4, 2012
Get the Rusty Ninjamug. the art of sporting socks with thong flip flops, which in fact look like the traditional footwear worn by Ninjas
at first glance he looked like a geek with his socks and flip flops on, but wait...don't ninjas wear stuff like that, he could know karate... he does have Ninja Toes!!
by nevets eural September 5, 2010
Get the ninja toesmug. 
A ninja boner is an erect penis that you must stealthily conceal whilst moving, which involves disguises and clever use of shadow and vegetation.
Often required when the words "Give it a minute" will not save you.
Often required when the words "Give it a minute" will not save you.
Last night Jen gave me such a ninja boner at the party, I had to creep around the outside of the garden in the dark to get a drink.
by Massive Jones June 7, 2007
Get the Ninja Bonermug.