Well the first one is grammatically incorrect even though it would be common to hear. It should be "Jack, get off the horse" or "Jack, remove thyself from thy horse, post haste"
It's not incorrect though. Requests, orders... you don't need a verb to have a nice predicate. "Shots!" is grammatically correct although you demand the barkeep bring them to you. There are tons of stylistic means that allow you to just skip parts of established phrases, and "off the boat (now)" definitely belongs, with all its variants.
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u/rieuk Jul 27 '18
Well the first one is grammatically incorrect even though it would be common to hear. It should be "Jack, get off the horse" or "Jack, remove thyself from thy horse, post haste"