He orders a glass of pimple and blotch at the bar.
pimple and blotch
idiom Slang
Cockney rhyming slang · East London
Scotch
Origin
For which a long indulgence can have a considerable effect upon the skin.
After a long day at the office, the old man likes to sit by the fire with a small measure of pimple and blotch.
The host poured his guest a generous serving of pimple and blotch, noting that the bottle had been aging in the cellar for over twenty years.