Manure: In the 16th and 17th centuries, everything had to be
transported by ship and it was also before commercial fertilizer's
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 can see 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 volatil! e 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.