Also, Jack Tar
Origin: 1775–85 http://dictionary.reference.com/browse/jack-tar
2. (noun) mariner, seaman, tar, Jack-tar, Jack, old salt, seafarer, gob, sea dog
a man who serves as a sailor
Synonyms: seafarer, pitch, knave, diddlysquat, yap, jackass, maw, diddlyshit, shit, doodly-squat, old salt, tar, hole, diddly-shit, mariner, laborer, diddley, labourer, sea dog, jak, jackstones, jackfruit, gob, manual laborer, diddly-squat, cakehole, trap, seaman, squat, diddly http://www.synonyms.net/synonym/jack
Naval An old civilian name for a sailor; probably derived from the black 'tarpaulin' hats worn between 1857 and 1891 (boater-shaped with cap-ribbon round the crown). Another theory explains the word JACK as a diminutive of Jacket (i.e. meaning a short jacket), the TAR referring to the old sailors practice of waterproofing their clothes with tar.
Found on http://www.britishempire.co.uk/glossary/http://www.encyclo.co.uk/define/Jack%20Tar
Jack Tar is naval slang meaning sailors. Historians believe that the name Jack Tar originated in the seventeenth century when sailors wore canvas breeches that were often spotted with tar from the waterproofing done aboard ship. There is a reference to Jack Tars in William Congreve's Love For Love (1695). http://www.tattooarchive.com/tattoo_history/j...