(noun) Generally used when referring to tonsil stones. This umbrella term can also be used to cover the various types of hardened deposits that accumulate on or inside the human body.
(1) Due to his abnormally large tonsils, Kyle has to remove scooties on a daily basis.
The term scoobies comes from "Scooby Snacks" and refers to charred bits of herb and ash you may suck in while hitting a bowl. While unpleasant, they are no where near as bad as a flaming scooby which is a still smoldering piece of bud that will scorch the back of your throat.
"Dude, that bowl is almost kicked. If you hit it too hard you'll get some mad scoobies . . ."