suck the monkey
verb- 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:
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Slang To drink from a coconut filled surreptitiously with rum, etc.