Yeot

Yeot is a variety of "hangwa", or Korean traditional confectionery. It can be made in either liquid or solid form, as a syrup, taffy, or candy. "Yeot" is made from steamed rice, glutinous rice, glutinous sorghum, corn, sweet potatoes, or mixed grains. It is presumed to have been used before the Goryeo period. The steamed ingredients are lightly fermented and boiled in a large pot called a "sot" (솥) for a long time.
"Yeot" boiled for a shorter time is called "jocheong" (조청), liquid "yeot". This sticky syrup-like "jocheong" is usually used as a condiment for cooking and for coating other "hangwa", or as a dipping sauce for "garae tteok", white cylindrical "tteok".
If boiled for a longer time, the "yeot" will solidify when chilled, and is called "gaeng yeot" (갱엿). "Gaeng yeot" is originally brownish but if stretched (as taffy is prepared), the color lightens. Pan-fried beans, nuts, sesame, sunflower seeds, walnuts, or pumpkin can be added into or covered over the "yeot" as it chills. Variations of "yeot" are named for their secondary ingredients, as follows.
The word "yeot" as slang.
In modern times, the Korean phrase "eat "yeot"" (엿 먹어라) has a vulgar meaning, comparable to using the words "fuck you" in English. The phrase originated from the middle-school entry exams scandal of 1964. One of the multiple choice questions asked in the exam: "Which of the following ingredients can be used instead of "yeot oil" (엿기름; barley malt) to make "yeot"?" The correct answer was diastase, but another one of the multiple choices was "mu" juice, which many people argued was also a correct answer. The parents of the students whose grades suffered from this result held demonstrations and protests in front of government education bureaus and offices, holding up "yeot" made with "mu" juice and yelling to the officials to "eat "yeot"".
The phallic shape of raw "yeot" had also led the candy to be used as a euphemism for penis as early as the sixteenth century.