Written material that is mostly a waste of paper. Padding. Press releases. Useless instructions that are included with something that requires no instructions. Blurb. Space-filler. Marketing material. Media packs. Worthless pieces of paper.

e.g. can you send me the bumf about that conference?

A shortened form of bum fodder, a.k.a. toilet paper.

Often bowdlerized as bumph or gumf.