Top Definition
The true spelling (internet spelling) for the word awesome. If you spell it like "osum" screw what everyone else says, you are awesome.
Tim: Yo Bill, that is quite osum.

Bill: osum?

Tim: Yeah, it's the hip new spelling for awesome.

Bill: Aw, gay.

Tim: No it's not, it's totally osum.
by thetruth. May 25, 2008
1/ The sound girls make when they say "awesome"
2/ The Czech word for "EIGHT"
Girl : "Oh, Alec! That V8 Skoda of yours, its just OSUM!"
by Velvet Revolution November 22, 2013

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