Piffindale is the 'Street' Slang word for the mind blowing type of high grade marijuana. Piffindale is often very stinky and leaves you feeling delirious after one zag-a-nai (spliff).
Examples of the piffindale;
Cheese, Blue Cheese, Blue Rhino, Ak47, Shevia, Amnesia and many more.
Andy: What crow have you got?
Charlie: I have the piffindale!!