I've stumbled upon a thesaurus entry for the word "ink" that connects it to various words to describe coffee or caffeine, none of which I have -ever- heard in my life! I'm a coffee-drinker, I'm American, I live in New York, and I've heard a lot of people talk about coffee and never once use the word ink to describe it... Scanning the first page of Google results provides no information on this.
My assumption, given that other online thesauruses have no mention of this coffee connection, is that this is just a mistake on Thesaurus.com, but I'm hoping it's either something antiquated and archaic, or some kind of inside joke put in Roget's 21st Century Thesaurus (the cited source according to Thesaurus.com)
Any insights?