Analysis of information sources in references of the Wikipedia article "Jitterbug" in English language version.
1945: "[The term] is from a Spoonerism ['bin and jitters' for 'gin and bitters'] ... and originally referred to one under the influence of gin and bitters" H. W. Fry, rev. of J. T. Shipley's Dict. of Word Origins, Phila. Bulletin, Oct. 16. B22.
Etymology unknown. Usually supposed to be a transferred sense of BUG n.1; but this is merely a conjecture, without actual evidence, and it has not been shown how a word meaning 'object of terror, bogle', became a generic name for beetles, grubs, etc. Sense 1 shows either connection or confusion with the earlier budde; in quot. 1783 at sense 1 shorn bug appears for Middle English scearn-budde (-bude) < Old English scearn-budda dung beetle, and in Kent the 'stag-beetle' is still called shawn-bug. Compare Cheshire 'buggin, a louse' (Holland).