Casually urinating in public, usually in a park, mall, or airport, but can be used in any place but a toilet or urinal. "Scraff" is not used in emergency situations in which a person really needs to pee. It is only used when a person only kind of needs to go, but goes just to be a dick and piss in public.

getting high off nothing, being highly excited

also, scraff face: very excited facial expression, widening the eyes and smiling very large.

scraff dance: dancing around with a huge smile on your face while holding four fingers up, moving them uncontrollably.

"Hot-Boxing" one more blunts in someone else's drive-way