The refuse thrown back into the excavation after removing the coal; gob stuff.(noun)
The process of packing with waste rock; stowing.(noun)
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Use "gobbing" in a sentence
"Anyway, may God help us all if there ever was a plague, I haven’t noticed any cessation in gobbing, sneexing and coughing without shielding using hands, ‘kerchief etc."
"First there's the whole 'gobbing' thing, spitting on the band as a compliment"
"Put your money where your mouth is and try making on the spot decisions instead of gobbing off from behind a computer."