shabby and worthless; poor in quality ...1888 colloq.
a poor, shabby or worthless fellow; an idle, ragged vagabond ...a1700 colloq.
to loiter, to lounge about, to shirk work ...B1900 Eng. dial.
a jingling alteration of 'shake-bag' - a rogue, scoundrel (obs.)
FIRST DOCUMENTED USE
a1700 - A New Dictionary of the Terms Ancient and Modern of the Canting Crew, B.E. (Gent), 1899 - Shag-bag a poor, shabby fellow
• A New English Dictionary on Historical Principles, James Murray,
• An Universal Etymological English Dictionary, Nathan Bailey, 1737
• The English Dialect Dictionary, Joseph Wright, 1898-1905
• A Glossary of Provincial and Local Words Used in England, Francis Grose, 1839