N Mouse 

a.k.a Mouse Wizard, is an osu!mania map created by drunkenstein
When set on 1.31x rate, it is considered to be eta difficulty
The map was later put in a mappack with extremely hard maps, Mouse Wizard 1.31 being one of them
Then it became a meme in the vsrg community and was called N Mouse instead of Mouse Wizard, due to the greek η looking very similiar to the english n

KaneMining: YO I 97.27% MOUSE WIZARD 1.31
Random Dude: WTF N MOUSE AND WYSI

N Mouse by EtDUDE123 June 9, 2022

mousey mouse 

someone who is really annoying, like a mouse, and nobody likes.

Gosh Xanders being such a mousey mouse…

mousey mouse by TTQVT July 13, 2022

Mickey Mouse ending 

A Mikey mouse ending is an ending to a story that feels undeserving and lackluster. If a story gets resolved without any consequence or reason, making the preceding plot easy to ignore, it demerits the struggle of the characters or the central themes that the story initially explored.

Tokyo revengers really got that Mickey Mouse ending.

Mickey Mouse ending by sandypandy311 November 9, 2022

Slip of the Mouse 

When, on the computer, you go to click on a file, page or button and accidentally click on the one next to it resulting in loss of work.

Example 1:
I'm really sorry I meant to press save but instead I pressed don't save, it was an honest Slip of the Mouse.
Example 2:
Damn, I made a Slip of the Mouse I meant to heal but I cast a spell, now I'm all out of mana.

Slip of the Mouse by Smoffie Bluester May 25, 2009

bald headed mouse on a trampoline 

stretching one's scrotum forward and shaking it up and down so that the tip of the penis bounces on it

hey stuart, did you ever see a bald headed mouse on a trampoline?

bald headed mouse on a trampoline by madfunfrank September 30, 2013

Eastertimes Tech X-08 LED Gaming Mouse Mice

You know how you would go play video games at your friend’s house as a kid, and he would let you be player 2 with his second crummy, off-brand, doesn’t-work-right controller? When you lost, you’d complain that it was all the controller’s fault, and half the time you’d be right. This mouse is like that. There is a place for cheap equipment intended for low-precision day-to-day work. A $15 mouse doesn't need to perform like a $150 mouse. But it still needs to get the job done. And Easterntimes Tech's offering here fails at that. I can’t fathom why this mouse is earning positive ratings on Amazon, except that it does indeed function and it’s super cheap. But what good is a cheap gaming mouse that sucks all the joy out of gaming? If you simply must have a wireless mouse and need to save money, you can buy a Logitech G602 for about $40 now, and while it doesn’t compare favorably to a $100+ gaming mouse, at least you won’t feel like throwing it across the room.

Guy 1: I have an Eastertimes Tech X-08 LED Gaming Mouse Mice.
Guy 2: Try not to accidentally kill yourself from frustration while using it.

Eastertimes Tech X-08 LED Gaming Mouse Mice by MasterJ5000 September 18, 2020

Roses are red, as silent as a mouse, i opened your door, i'm inside your house 

`look behind you

Roses are red, as silent as a mouse, i opened your door, i'm inside your house just say it

Roses are red, as silent as a mouse, i opened your door, i'm inside your house by MasterKuby January 23, 2021