Flickstick
Solidified but viscous micro-boulder of nasal discharge, commonly referred to as "snot" or "booger", that stubbornly sticks to your finger when attempting to "flick it off". Flicking is employed for the purposes of booger disposal after digitally cleaning the nasal passage and executed most often in the absence of a hankie or tissue.
He didn't know that I had serious Flickstick when I shook his hand.