Rengoku donut is a way of making fun of Rengoku from Kimetsu no Yaiba/Demon slayer since he got punched in the heart by Akaza, and it left a round hole like a donut
Someone:OMG I CRIED SO MUCH WHEN RENGOKU DIED😭. Someone's freind: RENGOKU DONUT LOL🤪. someone: FUCK YOU
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