Certain types of manure used to be transported (as everything was back then) by ship ... well in dry form it weighs a lot less, but once water (at sea) hit it, it not only became heavier, but the process of fermentation began again, and one of the by products is methane gas . . . and 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 discovered what was happening. After that the bundles of manure where always stamped with the term S.H.I.T on them which meant to the sailors to "Ship High In Transit". In other words 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.
Of course, the real orgin is something like this:
[quote]The word shit entered modern English language derived from the Old English nouns scite and the Middle Low German schite, both meaning "dung," and the Old English noun scitte, meaning "diarrhea." Our most treasured cuss word has been with us a long time, showing up in written works both as a noun and as a verb as far back as the 14th century.
Scite can trace its roots back to the proto-Germanic root skit-, which brought us the German scheisse, Dutch schijten, Swedish skita, and Danish skide. Skit- comes from the Indo-European root skheid- for "split, divide, separate," thus shit is distantly related to schism and schist. (If you're wondering what a verb root for the act of separating one thing from another would have to do with excrement, it was in the sense of the body's eliminating its waste
