1. A hard piece of snot, just inside the nostril but visible to anyone within conversation range. Usually hangs from and surrounds a nose hair the way wax surrounds a candle wick.
2. A semi-hard piece of snot that flies out of you nostril into a handkerchief or the palm of your hand when you sneeze.
Snurdle; the perverse act of surreptitiously sniffing the still warm bicycle seat of a female cyclist after she has just vacated the saddle. Usually for purposes of cheap sexual thrills and more often than not accompanied by pig style grunting noises.