scoobied means totally clueless, you may feel like this if youve gon in for your physics exam , and your minds went 100% blank, you are utterly and totally scoobied.
"man i failed that exam, i was totally scoobied"
Clueless: Haven't got a clue.
Rhyming slang - Scooby Doo: Clue
"I dunno man, I really don't know. I'm scoobied"