Green’s Dictionary of Slang

1. a shabby, down-at-heel person.

1675		Head Art of Wheedling 160: This Town-shift is sometimes called [...] Ruffin, Shabbaroon, Subtler.
c.1698		B.E. Dict. Canting Crew n.p.: Shabberoon, a Ragamuffin.
a.1704		T. Brown Letters from the Dead to the Living in Works (1760) II 184: That whore, my wife [...] that us’d to open her sluice and let in an inundation of shabroons to gratify her concupiscense.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1834		‘Jack Downing’ Andrew Jackson 122: Let me see that you are jonnok, when these shabbaroons of England attack you.

2. a mean-spirited person.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.