An unspecified but substantial file size. Used hyperbolically to emphasize inordinate or bandwidth-cap-exceeding data size, and is often preceded by an arbitrary large number.
Guy 1: Dude, why you don't you download it in 1080p?
Guy 2: Well, I would, but it's nearly three hours long, so that's like 87 bazillion mightybytes.
by Dudevid October 13, 2009
Get the Mightybyte mug.