gobbing

/G AA1 B IH0 NG/
verb
  1. 1

    To gather into a lump.

  2. 2

    To spit, especially to spit phlegm.

  3. 3

    To pack away waste material in order to support the walls of the mine.

noun
  1. 1

    The refuse thrown back into the excavation after removing the coal; gob stuff.

  2. 2

    The process of packing with waste rock; stowing.

Source: https://en.wiktionary.org/wiki/gob, https://en.wiktionary.org/wiki/gobbing