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Used when you're mocking someone who thinks they're cool. They make an O smile like they just won the lottery, but you know they're just happy they didn't get caught eating a taco at 3 a. m.
He did the O smile after I told him his pants were on backwards.
She did the O smile when I said her hair looked like a raccoon’s nest.
He did the O smile when I told him his mom called him a ‘fart in a jar.’