Green’s Dictionary of Slang

Forsyte Saga n.

lager.

1979		R. Barker Fletcher’s Book of Rhy. Sl. 39: I will have to go and pour him a large Forsyte Saga to keep him quiet.
1985		Wheeler & Broadhead Upper Class Rhy. Sl. 49: In this land ruled by the sun and craving the world of the Forsyte Saga.
2002		D. Shaw ‘Dead Beard’ at www.asstr.org 🌐 She’s a small thing anyway, so I’ve got to open her up like a can of forsyth saga.