Some dance historians say there is evidence to suggest that the term "shagger" was used to refer to vaudeville performers in the late 19th century [3], who were known to have danced the Flea Hop. Later "shag" became a blanket term that signified a broad range of jitterbugging (swing dancing). In the 1930s there were arguably a hundred or more variations of the dance, which differ in various respect depending upon the geographic region in which they were done.
wikipedia
I love Big Joe Turner his original version of shake rattle & roll makes you realise how anemic Bill Haley was.
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Towing a Chief Arrow with a Colorado LTZ (All by Myself)