Manure: In the 16th and 17th centuries, everything had to be
transported by ship and it was also before commercial fertilizers
invention, so large shipments of manure were common.
It was shipped dry, because in dry form it weighed a lot less than
when wet, but once water (at sea) hit it, it not only became heavier,
but the process of fermentation began again, of which a by product is
methane gas. As the stuff was stored below decks in bundles you cansee
what
could (and did) happen.
Methane began to build up below decks and the first time someone
came
below at night with a lantern, BOOOOM!
Several ships were destroyed in this manner before it was determined
just what was happening.
After that, the bundles of manure were always stamped with the term
"Ship High In Transit" on them, which meant for the sailors to stow it
high enough off the lower decks so that any water that came into the
hold would not touch this volatile cargo and start the production of
methane.
Thus evolved the term "S. H. I. T " (Ship High In Transport) which
has
come down through the centuries and is in use to this very day.
You probably did not know the true history of this word.
Neither did I.
I had always thought it was a golf term.