Green’s Dictionary of Slang

1. (UK prison) a warder [ = screw n.¹ (2c)].

1998

R. Puxley FreshRabbit.

2. (also scooby) a clue.

2000		J.J. Connolly Layer Cake 270: For about five minutes after, nobody’s gonna have a scooby-doo what’s goin on.
2001		K. Sampson Outlaws (ms.) 110: I haven’t got a fucking scooby what I’m talking about here.
2003		Eble Campus Sl. Nov.
2012		(con. 1980s) I. Welsh Skagboys 21: Ah huvnae goat a fuckin scooby what ah’m daein here.
2015		I. Welsh Decent Ride 32: I thought you didn’t know who I was! [...] Hudnae a Scobby till ah googled ye.
2015		N. Cummins Tales of the Honey Badger [ebook] Personally, I didn’t have a Scooby Doo what everyone was laughing at.

3. (Scots teen) a Subaru automobile.

2009		L. McIlvanney All the Colours 83: ‘Scooby [...] Nice ride. Is it turbo, mister?’.
2020		G. Armstrong Young Team 127: The Scooby flashes its lights.