John Camden Hotten, The slang dictionary
“ A vessel is often known by the cut of the JIB sail; hence the popular phrase, “to know a man by the cut of his JIB.”Jibb, the tongue.—Gipsy and Hindoo. (Tramps’ term.) Thence extended to mean language.Jiffy, “in a JIFFY,” in a moment.Jigger, a door; “dub the JIGGER,” shut the door. Ancient cant, GYGER. In billiards, the bridge or rest is often termed the JIGGER. Also, the curtain of a theatre. Jigger has many meanings, the word being applied to any small mechanical contrivance. Printers use the word for a little machine which guides the eye when copy is minute. ”
