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French for oh face, used when you get a big one and your boss is watching but you act like you're fine. It's fake and full of pride. Say it fast like you're mad.
My boss walked in and I had to hold it in. O! Fassé, baby.
I got a hard one and my manager was right there. O! Fassé, I'm not even mad.
He came in and I had to fake a smile. O! Fassé, I'm winning.