scooby doo

/ ˌskuːbɪ ˈduː /

noun

1. Often shortened to: scooby. slang:rhyming,  a clue

   I don't have a scooby doo what you're talking about

Word History and Origins

Origin of scooby doo¹

C20: from Scooby Doo , a cartoon character on children's television