jug (n.)
"deep vessel for carrying liquids," late 15c., jugge, variant of jubbe, of unknown origin, perhaps from jug "a low woman, a maidservant" (mid-16c.), a familiar alteration of a common personal name, Joan or Judith. Use as a musical instrument is attested from 1946. Jughead "klutz" is from 1926; jughandle "tight curved road used for turns" is from 1961. Jugs for "woman's breasts" first recorded 1920 in Australian slang, short for milk jugs.