When I was a kid in early 1950's I visited Harry (Haywire Mac) at his
home in San Pedro, California. He was what he called a "railroad boomer" meaning he could hop freights with impunity as he was a railroad worker without being dumped by the "bulls" (the guards with clubs to
knock off the 'bo's.)

He was amiable and supportive. I remember that day we attended a concert by a Mexican Tipeca Band at the San Pedro Park.

I don't think he would have thought big cocks were a good rewrite on his
song. There was a caveat intended for young men to go off onto the hobo life though. There were many young men who lost their legs while attempting to swing into an open boxcar from the ladder. A well-seasoned 'bo had no trouble and could even dive out of a moving box
car head first. I actually saw that happen when me and a friend
were in one in the San Joachim Valley en route to San Francisco.
I learned to play five-string banjo in that car having learned the
basic "bum-ditty" strum from Eddie Mann, a Pete Seeger follower in L.A.