1.
Oh Shit It's Monday;
The opposite of TGIF.
See also HSIM
by Dr. Robert January 23, 2004
 
2.
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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