sucking the monkey

Verb

suck the monkey (third-person singular simple present sucks the monkey, present participle sucking the monkey, simple past and past participle sucked the monkey)

1. (slang) To surreptitiously drink alcohol from a cask through an inserted tube.
   • A new farce, called "The Wigwam," was produced at the Lyceum Theatre on Monday night. [...] As might naturally be expected, Cora has another lover, one Mingo (Mr. Oxberry), known as the "Monkey's Uncle," from his habit of "sucking the monkey."1847 January 31, “Lyceum Theatre”, in The Observer, London: William [Innell] Clement, →OCLC, page 5, column 3

   Synonyms:

   bleed the monkey

2. (slang) To drink from a coconut filled surreptitiously with rum, etc.