Green’s Dictionary of Slang

Jonathan Ross n.

[rhy. sl.; ult. UK TV personality Jonathan Ross (b.1960)]

1. a drink, spec. beer [sauce n.1 (6)].

[Scot]I. Welsh ‘The Shooter’ in Acid House 5: You don’t want to be knocking back too much of the Jonathan Ross, he pointed at my glass.
[UK]R. Puxley Fresh Rabbit.

2. a toss n.1 (1)

[UK]R. Puxley Fresh Rabbit.