Untapped involuntary asskickery potential which can only be accessed after walking through a spider web. Usually accompanied by a girly scream and kung fu hands.

Highly amusing to watch from a distance.
P1: "Maaaan, what was that shit ?"

P2: "Ergh. Spider web."

P1: "Oh. Hahahaha... Instant Ninja"
by Iron_tech April 22, 2012
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TO READ an important convo on im about u or sumone/thing u kno and poppin outta nowhere and replyin to the comment!
DAMN! did u hear about tht boy teryn?
YEA hes way ugly!
"TERYN POPS UP cause he was NINJA READING!
I HEARD U BITCH amd u clit smells like fried piss on a dead hooker!
by woofulz April 2, 2008
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The art of mysteriously and secretively tweeting multiple times whilst being fully engaged in a two-way conversation.
Bob: Bro, we've literally been talking this entire time and you don't even have your phone near you. How did you manage to tweet 15 times in the last 3 minutes?!

Mox: Two words my friend: Ninja-Tweeting.
by maxamillianimus January 15, 2012
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a HotBox Ninja is someone who has to sneak in the bathroom and smoke weed because they are an in the closet pothead.
Ducky: Why were you up so late?
Nova: I was being a HotBox Ninja in the bathroom last night.
by SD Nova May 27, 2017
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a hot chick with ninja like moves and the sexual prowlness of a puma
dude you see that puma over there? you mean the one standing right behind you.. whoah! puma ninja
by redickulos April 24, 2011
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1. when someone comes completely out of nowhere during a race or any other event.

2. fighting a single person or a group of people like ninja
"That guy was in last place for the race but he just Ninja Attacked us."
by y.cole March 4, 2012
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The descrete and tactical act of taking a large poop in the upper tank of the toilet in someones house you really fuckin hate. No matter how much you flush or spray deodorizor..that stank aint going away.
This party sucks, im gonna ninja bomb it and head on out. See ya.
by Gdaiv747 September 16, 2019
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