Top definition
A folder, category, box, etc., that serves either no purpose or a purpose so small it's not worth keeping.
Person A: Why is there an empty box in the storage room?
Person B: In case we need to store any dirty diapers.
Person A: But we don't have any babies in the family.
Person B: That doesn't mean we'll never have any.
Person A: I'm not allowing a filler folder in this house!
by Jaytan804 February 16, 2018
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