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A fancy way of saying you're totally right, but you're also too hyped to care if you're right or not
Yo, I'm o fo sho, I just saw a raccoon in a suit walking into a Starbucks.
I'm o fo sho, I just got a 100 on my math test and I'm still mad about it.
I'm o fo sho, I just yelled at a chicken and it ran away.