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A practice weapon for sword-based martial arts. Thought to be relatively harmless, but when used with even a moderate amount of accuracy and force may be used to break bones.
I can't find anyone to spar with me, the last time i used my shinai I broke someone's wrist.
Shinai by psivamp February 2, 2005

shitability 

The level of ease (or difficulty) of a particular item to be ingested orally and successfully passed via bowel movement.
"Be careful, Mervin. Those Walmart hotlinks have a low shitability score."

"Too late, Elroy. I'm fartin' blood over here!"

The shinobi law of numbers 

The fighting capacity of the individual ninja is inversely proportionate to the number of similarly dressed shinobi present. Other wise known as the inverse law of ninjas.
The shinobi law of numbers says that all except one ninja will be cannon fodder, and the last one remaining will utterly wtfpwn everything else around him.
The shinobi law of numbers by Eloka December 13, 2008
Bamboo sword used in Kendo.
shinai by Samurai Katsu September 3, 2003

Shinobi Life 2 

Shinobi Life 2 is a game where rinnegan = win
"You wanna play some Shinobi Life 2" said Jack. "I am going to kill myself tonight Jack" said his Father.
Shinobi Life 2 by zuroah October 19, 2020
bamboo stick; used mainly by in-training students of certain arts/styles. It can shatter easily if used to strike hard.Also referred to as a Kendo stick and Singapore cane.
My shinai broke after training.
shinai by anonymous June 25, 2003
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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