Top Definition
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.
by Gern-haha December 13, 2010

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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
by chanae November 22, 2003

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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A big peice of shit, also known as "Mike", or "uni", or "Koala Bear". All mean the same thing. An asshole.
Your as dumb as a koser!
by DeadzeroCustom August 18, 2003

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt