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A nasty nickname for your mom when you're too lazy to think of anything better and just want to insult her with a little extra swear words.
DM: Hey mom, you're the M. I. M. L. G. I. T of this family
Text: You're the M. I. M. L. G. I. T and I'm not even mad
Tweet: My mom is the M. I. M. L. G. I. T and I'm still her favorite