1) Northeastern U.S. slang for Valium (AKA diazepam) tablets and/or Vicodin tablets. Can be heard in various songs, including the Fun Lovin' Criminals' song, "Scooby Snacks."
2) Occasionally used to refer to Quaaludes.
3) A hash brownie.
1) "Running around robbing banks, all wacked off of Scooby Snacks!" - "Scooby Snacks" by the Fun Lovin' Criminals.
2.) That's okay! Another Scooby Snack, and she'll love me again!
3.) Dude, these are some tasty Scooby Snacks!
When involved in the consumption of marijuana via a common metal or glass pipe, minute pieces of marijuana or ash or resin build-up may be inhaled into the mouth or throat, thus resulting in the "Scooby Snack."
Chad: "Watch that hit man, I know it's close to kieshed so you might..."
Matt: *spit* *hack* *cough* "Aw, man, I just got wicked hefty Scooby Snacks on that!"