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M. D. I. B means my dick is big. It came from some dudes in New Jersey who bragged about their meat like it was a competition.
Bro, I just got a 10 out of 10 at the club. M. D. I. B.
My cousin tried to flex. M. D. I. B. I laughed so hard I peed my pants.
I told my mom I was going to the store. M. D. I. B. I never came back.