The extracting of a person's nasal mucus (UK term bogeys - referred as 'boogers' in the US) from
one's nasal passages. The term 'mining for emeralds' came about due to the nasal materials' similarity in
colour to the
emerald jewel.
1. "Oops, nearly got caught mining for emeralds there!"
2. "Urgh, have you seen the
bog - someone's been mining for emeralds all across the
wall!"