Green’s Dictionary of Slang

Billy Whizz n.

[Billy Whizz, a character in a children’s comic; as his name suggests, he moves fast; note whiz n.4 (3)]
(UK drugs)

amphetamine.

Show quotations
[Scot]I. Welsh Trainspotting 331: Sick Boy really wants some Billy Whizz, to cut down the hideous travelling time.
[UK]Nicholas Blincoe ‘Ardwick Green’ in Champion Disco Biscuits (1997) 12: He dug in the flat front pockets of his Farahs for the wrap. He had four on him but he’d marked the outsides with a letter so he wouldn’t get mixed up. BW stood for Billy Whizz.
[UK]R. Milward Ten Storey Love Song 9: [N]ecking loads of espressos while on the Billy Whizz.
[UK]Private Eye 7-20 Jan. 29/1: Billy Whizz (1964) hangs on [in the Beano] despite having become a slang term for amphetamines.