"OSN!" is an abbreviation for the commonly used ghetto phrase..
"Oh shit nigga!"
Anthony & Cuta were playing XBOX for 12 hours straight when Anthony finally dominated the game and made Cuta wish he had won.
Anthony: OSN! I dominated that game.
Cuta: What is this a contest?
Anthony: In your face!
Cuta: Wish I drove a soup kitchen van.
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