overstuffing

/OW1 V ER0 S T AH0 F IH0 NG/
verb
  1. 1

    To stuff to excess.

  2. 2

    To cover completely with soft upholstery.

noun
  1. 1

    Material used in upholstering just under the top fabric.

Source: https://en.wiktionary.org/wiki/overstuff, https://en.wiktionary.org/wiki/overstuffing