Definitions of filler:

• noun:   the tobacco used to form the core of a cigar
• noun:   copy to fill space between more important articles in the layout of a magazine or newspaper
• noun:   100 filler equal 1 forint
• noun:   used for filling cracks or holes in a surface
• noun:   anything added to fill out a whole
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #17353)