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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

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