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Backpacks that kids use in elementary schools in Japan. They are incredidly expensive because they are supposed to last throughout the entire 6 years of elementary schooling. They are made out of leather or synthetic leather-like materials. New leather randoseru can cost 30,000 yen or higher, but if they are made from the synthetic material clarino, the price is lowered.

The traditional colors are red for girls, and black for boys. Randoseru are in demand by anime and manga fans, but few manufacturers produce them outside of Japan.
Man, that randoseru is expensive.
Randoseru by Miyaviya June 7, 2007
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Randomer 

A stranger/unknown person. Usually a friend of a friend.
"Who are those randomers over there?"

-Q. "Do you need a lift to the party tonight"

-A. "Yeah, can I bring a randomer along too?"
Randomer by xLx July 24, 2004

randomers 

Random people. People you don't know, and who seem to be there for no reason. Strangers, or barely-there acquaintances.
The ones nobody invited to the party, but who hang around anyway - no-one will ask them to leave, as no-one knows who invited them in the first place.
My Facebook friends are a mix of colleagues, school friends, and randomers I couldn't turn down in case I'd met them and forgotten about it.
randomers by Blue Jack May 4, 2009

Randomer 

Someone you meet on a night out who noone knows but you remember later usually the next day
Who was that Randomer Dave was with last night?

Some randomer is after getting into my pictures
Randomer by sonicboombox November 1, 2007

Randomer 

Someone of no real significance or importance in your life, who's just kind of there as part of the human population waiting to return to their nest. They could someday be important to you, but until then they are still just a randomer.
*You're opening a locker next to a randomer who is also opening his locker*
You: What's up.
Randomer: Hey, not much, you?
You: Nice, not much.
Randomer: Cool, later.
You: Later.
*You both leave the lockers and forget about each others' existence*
Randomer by subtalvik2 May 17, 2011

randoner 

The case of being where a male preferably of choice achieves a boner during non secual activites.

zacharhia- Dude guess what happend yesterday
Max- What?
Zacharhia- I was in the middle of swiiming lessons and i got a randoner!
Max- wouldnt really matter cuz you have the biggest chode ever
zacharhia- Dude guess what happend yesterday
Max- What?
Zacharhia- I was in the middle of swiiming lessons and i got a randoner!
Max- wouldnt really matter cuz you have the biggest chode ever
randoner by THE CHODEMASTER FLEXxx October 9, 2008

randomer 

Synonym for 'random' - a person unknown to a group or one who says/does things which are inconsequential, makes contributions which are unconnected with the topic under discussion or behaves in ways which do not match the norms of a group or sub-culture.
Some randomer just walked in and left a plastic gnome on the bar.
randomer by maninbeijing April 8, 2013
More from Urban Dictionary

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
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
NYC people who migrate north to Quahog, RI to see the leaves in the fall.
New York and everyone from there can fornicate themselves with an iron stick.
leafers by ss++ February 8, 2005
Word of the Day on September 27, 2026
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