booger turd
Those pesky boogers that you pick but can't get off of your finger. They keep on sticking to you.
When I am picking my nose, every once in while I pick a very sticky, mostly round booger. When I try to flick it off, it doesn't flick. It keeps on sticking to my finger. The only way to get rid of it is to wipe it on something or someone. It's like a turd that won't go away; thus it is a booger turd.