Jimjams - Slang. extreme nervousness; jitters. Origin: Jimjams is a gradational compound based on the word jam meaning "to press, squeeze, or fill tightly." The sense “nervous jitters” entered English in the 1800s.
Swing dancers are often referred to as jitterbugs because they dance without any control like an alcoholic who suffers from the ‘jitters’. It can also mean a type of Swing dance or the act of Swing dancing. In 1934, Cab Calloway recorded Call of the Jitter Bug and the film Cab Calloway’s Jitterbug Party which popularised the word.
jitterbug dance contest, San Francisco. The jitterbug dance was very popular in the late 1930's. It had people going crazy! The jitterbug is a kind of dance popularized in the United States in the early twentieth century and is associated with various types of swing dances such as the Lindy Hop, jive, and East Coast Swing.