Japanese word for "mug". As in a "beer mug".
Beer and sours are usually ordered in an izakaya in 3 different sizes: a glass, chuu jyokki (middle sized mug), or dai jyokki (large sized mug).
As I am a kyuuryou dorobou, a member of the lesser salaryman family, it is very important for me to have the arcane knowlege of the art of drinking in an izakaya and I must teach it to all those who thirst for this knowledge.
The word jyokki is written in katakana.