Meaning

• A lump of soft or sticky material.

• The mouth.

  "He′s always stuffing his gob with fast food."

• Saliva or phlegm.

  "He spat a big ball of gob on to the pavement."

• A sailor.

• Waste material in old mine workings, goaf.

• A whoopee pie.

Meaning

• To gather into a lump.

• To spit, especially to spit phlegm.

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