if an item has a fine consistency, such as koolaid, pepper, or Jerusalem Artichoke, and can be snorted for considerable pleasure, the item is then deemed as "snortable"
Hey man, is this asiancandy you bought snortable?
I dunno man, it kinda smells like butterflies, I wouldn't
Snortables refer to any and all drugs that can be snorted.
If you can't be bothered to name every powder you are carrying you just refer to it as snortables.