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You say 'D'mello that shit' when someone makes a meme so bad it makes your brain hurt and you want to punch them.
You see a meme of a cat wearing a hat and it's labeled 'The Best Meme Ever', you reply, 'D'mello that shit.'
Your cousin sends you a meme of a pineapple on a pizza and you say, 'D'mello that shit.'
Your teacher shows a meme and you whisper, 'D'mello that shit.'