farmer spit

When one closes off a nostril (usually with their index finger or thumb) and uses the extra exhalation force in the opposite nostril to rocket a harden mucus projectile out of said nostril. Aka snot rocket.

When Bobby Joe was plowing the field he done got his nose all plugged up with dirt. But when he finished with the backhoe I'll be damned if he didn't farmer spit a boulder out of his nose!