The origin of Jumping Jimmy

[rogerdonnay]

I asked Rick Warden what is the origin of the term Jumping Jimmy.
This was his answer:

All I know about "Jumpin Jimmy" term is that when
the ship was in Australia a kangaroo was given to the
ship (early 60's I think). The Kangaroo made the ride home
where he went to the San Diego zoo. Therefore, Jumpin;
from the kangaroo and that she was a tin can that jumped
in the heavy seas and Jimmy nickname for James.
Above information is word of mouth.

If anyone has more information than this, please reply to this post.