Lyric discussion by jumpin_jack_flash 

i can say in relative confidence, that the song jumpin jack flash was when keith and mick where in keiths redlands mansion and keiths gardner, Jack Dyer walked past the window at 6am, schwelching loudly with his soaking boots on the path, mick was startled and keith explained it was "Jumpin Jack" and that night they laid down the base for the classic song. As regards a heroin perspective, this perhaps may be a side meaning, at a later stage... but that is how the song was created originally.

You are right on and their book says Mick and Keith were on acid when ole Jack walked past.

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