MAFU stands for Mental Toughness, Attitude, Fanatical Effort,
and Unity. It's a club that football players on defense can join
based on performance on the field. I've only seen it attributed to
colleges in Utah where it seems the former coach of the University
of Utah (Ron "Mac" McBride) coined it, and it has spread to other
schools with former Utah coaches and players moving on to coach in
other places (Weber State University for example). Hope this
helps.