British, adj. — Green’s Dictionary of Slang

British adj.

SE in slang uses

In compounds

British burgundy (n.) [var. on English burgundy under English adj.]

porter (a type of dark beer brewed from malt).

1784

J. O’Keeffe Fontainebleau in Dramatic Works (1798) II 237: waiter: Here, Sir John, my mistress has sent you a treat. sir john: What porter! London porter! [...] Oh, glorious Mrs. Casey, in France, to give me British Burgundy.

British champagne (n.) (also British champaigne) [a tribute to the quality of the beer or a sneer at the lack of homegrown wines]

porter, dark ale.

1811		Lex. Balatronicum n.p.: british champaigne. Porter.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.

British roarer (n.)

the lion that appears alongside the unicorn on the British national coat of arms.

1909

J. Ware Passing Eng. of the Victorian Era.