Green’s Dictionary of Slang

purger n.

also perger
[negative image of teetotallers]

a teetotaller.

[UK]A. Stephens ‘The Chickaleary Cove’ 🎵 My tailor serves you well, from a perger to a swell.
[UK]‘William Juniper’ True Drunkard’s Delight 251: A teetotaller – a purger or perger.