Internet slang for awesome. Awe was shortened into a single 'O' and some was changed into sim for a shorter pattern of letters which, when arranged and verballed expounded produces a sound entirely similar to the original word.
Ricky: That's osim mate, good job.

Derek: Yeah, it was pretty awesome, I'm just glad I pulled it off in time.

Ricky: I hear ya, I'd never be able to in that timeframe
by Ricky Day March 20, 2008

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Top Definition
Oh Shit It's Monday;
The opposite of TGIF.
See also HSIM
by Dr. Robert January 23, 2004

The Urban Dictionary Mug

Lotsa space for your liquids.

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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.

Create a mug

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.

Buy the t-shirt

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