You swallowed too much air.

 You ate hard-to-digest foods.

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 Ed's Fart Shootout. Dead Yogi

NBC2FARTS

 "There’s gas, and then there’s flatulence—they’re not exactly the same thing. Gas is air in your digestive tract. Flatulence refers specifically to the excess gas in your stomach or intestines that can cause bloating and, well, farts."

It can fairly be reported that this is a
photograph of hard-to-digest foods.