Alright - I know who Mr. Johnson is, but does anyone know the origins of the term?  Just curious.

These two London barristers vied for success with the ladies:
Huge Johnson, QC, and Engorged Schlong, QC.
Schlong, my own great grandschlong he was, actually wrote the Grove Press book, Memoirs of a Victorian Gentleman, published in the late 1960s when I was at NYU Law studying the Mann Act as applied to consensual, non-monetary sportf**king.

Now you know.

Modernists and historical revisionists may disagree, but this is the true historical origin.

Law Librarian, aka Engorged P. Schlong IV, Esq.
The "P" stands for "pulsating."

My grand schlong probably would like to seek milk and other pleasurable treasures from you.