Definition of rumfustian in US English:

rumfustian

noun

historical
  • A hot, spiced drink made of strong beer, white wine, gin, egg yolks, lemon juice, and sugar, popular during the 19th cent., originally among university students.

Origin

Early 19th century; earliest use found in Blackwood's Magazine. From rum + fustian.

Pronunciation

rumfustian

/rʌmˈfʌstɪən/