I agree with that definition but just to add to that I think filler may have started as a coin collecting term.
Beginning collectors used to start by filling up folders where each coin in a series (say, Lincoln cents) had a designated pocket or slot. Some slots (1909-S VDB, 1909-S, 1914-D, etc.) would be expensive to fill with a high grade coin, so a lower grade one could be used as a "filler".
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My avatar is a drawing of a 1958 Topps Hank Aaron by my daughter. If you are interested in one in a similar style based on the card of your choice, details can be found by searching threads with the title phrase Custom Baseball Card Artwork or by PMing me.
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