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A fatty of fun is when you’re so wasted you can’t tell your pants from your face and still manage to laugh like a maniac.
I had a fatty of fun at the party. I drank 12 beers and fell into a pool. Still laughed like I won the lottery.
My cousin had a fatty of fun at the concert. He tried to sing along and ended up yelling at the stage.
I had a fatty of fun at my friend’s birthday. I ate cake, drank soda, and then did a backflip into a pizza box.