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.
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
Did you see that kid last night? He totally went drunken ninja, i couldn't find him all night.
Somebody who always seems to know where everybody is at all times, even when huge amounts of effort have been taken to ditch them.
Originates from the way in which they travel mostly through the rafters, so as to stay out of everyone's awareness like a ninja
Person 1) Wow... I can't believe it, we managed to ditch Barfield. Now to spend some quality time with the amigos without jokes being undermined etc.
Barfield) *sprints along rafters like a Shinobi, darting from the shadows with unprecedented stealth* Hey guys, what are you all doing in town? You told me you all had the plague... You weren't tryin to ditch me, were you?
Person 2) Jesus, you're such a fuckin' rafters ninja
When you run really fast into a room and close the door because you imagined that a ninja was chasing you or some other sort of danger approached. Generally used to prepare for a future ninja attack.
QUICK! RUN!
why did i just run into your room?
32 seconds. Good ninja drill time.
A prank that is pulled usually in high school by taking someone's back pack, taking everything out, turning the backpack inside out and putting the stuff back in.
Dammit! The seniors ninja sacked me again.
A person who can take a shit any place, any time, without anyone knowing about it.
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.
To throw up so violently that it causes one to strike a ninja pose.
Bill drank too much last night. He ended up ninja chucking his beer all over the bathroom.
I just ninja chucked so hard I punched the wall.