Simple abbreviation for "my dick is big" Originated by a small group of friends from Ohio and was later turned into a mw2 clan, with the clan tag being (mDiB) of course. Shortly after we noticed the appearance of many fanyboys (especially from New Jersey). Any girls wanting to join simply put (mViT) as their clan tag, which meant "my vagina is tight" and yes... we did have girls join. Rather than use it to talk about each other's dicks (Like people from New Jersey do), for us in Ohio it is a simple way of saying "I don't give a fuck because i'm big in the pants"
Angry COD Nerd from New Jersey: "OMG! you guys aren't even good!"
RiZZy: "I don't give a fuck sissy! m.D.i.B BITCH!!!!