Fromphlegm +‎cutter; first use appears c. 1806.

phlegm-cutter (pluralphlegm-cutters)

1. (obsolete,slang) Analcoholicdrink, especially one consumed beforebreakfast.
   • 2022, Brian Penton,Landtakers: The Story of an Epoch:

     "If I'm good enough to talk about I be good enough to drink with," Peters shouted. "Fritz! Squarehead! Twophlegm-cutters here."

• gum-tickler