Koser 

Originated from the abbreviation KOS "Kill On Sight"

It's a word in online video games used to refer to people who are KOS.

It is more commonly used in the online game Roblox.

Dude, that koser just killed me for no reason.
The kosers are killing everyone.
i'm hackin all of you stopid kosers,

Koser by Mr.Koalas April 25, 2020

Koser 

When you go to the bathroom to take a shit and instead of it being enjoyable. it feels like the world is ending if only the smell dosent take you first.

It may often splash up, as a final "fuck you" which makes the wiping process that much worse.

X:Dude I dont know what i ate last night but I just dropped a koser and am still surprised im here.

Y: Yeah man, those really can ruin not only a day but a week.

Koser by Gern-haha December 14, 2010

koser 

loser but misspelled

-you suck
-oh fuck you, you KOSER
-*loser

koser by nick_fox February 20, 2020

koser 

for something to be nasty, not right or just something you wouldnt do

oh my goodness did you see her nappy hair, i swear that aint koser

koser by chanae November 22, 2003

Koser 

supa swaggggers

Kosers are the swaggiest family, especially the eldest daughter, Ems

Koser by saltytoess September 13, 2021

koser 

an acronym used in fighting or survival games, mostly in roblox, to describe someone who ‘kills on sight’ or kills anything it sees. most of these people are really toxic.

player: “HEY STOP KILLING ME YOU KOSER”
koser: “L BOZO GET BETTER AT THE GAME”

koser by mochaXX16 January 14, 2024

Koker 

A chem teacher who wears Hawaiian shirts on Thursdays, likes puns, and occasionally tells long stories that either end with a pun or relate to a chem topic (or both).
Note a koker will use peanut butter sandwiches as a simile for almost all types of bonding.

(Jonah walks into chem class with a Hawaiian shirt on Thursday)
Grant “your such a koker”

Koker by epicgamer22 January 23, 2020