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To eat up a storm means you’re so hungry you could swallow a cow whole and still ask for seconds. You’re like a monster with a mouth and no brain.
My cousin ate up a storm after not eating for three days. He finished three plates of jollof rice and still wanted more.
At the party, my aunt ate up a storm and ended up in the bathroom throwing up.
My brother ate up a storm during the World Cup final. He ate so much, he couldn’t watch the game.