Been jumped all over about this before, but, in short.... 1. Lindy Swing and Lindy Hop are 2 different dances. Find a vid on Frankie Manning (early dancing) and you have Lindy Hop. Watch Swing Kids, and you have Lindy Swing... not similar. Further, find a vid on Frankie's more recent workshops, and you have Savoy... a little smoother, bebop, style than the other 2. 2. Jitterbug: a triple step swing danced to Lindy and/or Stomp music. Named for a US southern beetle that pops (jitters) up and down to flip itself over. The reference to one having the jitters, etc, all come from the same thing. The dance was popular in the several subcultures, and the lingo of same seeped into the dance halls, etc., hence the name jive (different name... same dance; not to be confused w/ the high knees jumpy thing that we see at comps, today).