Green’s Dictionary of Slang

a hungry person, a glutton.

1608		Merry Devil of Edmonton II i: Away, I have knights and colonels at my house, and must tend the Hungarians.
1613		Rowlands ‘To a Gormandizing Glutton’ Knave of Spades & Diamonds 110: A monstrous eater [...] Invited was unto a gentleman, / Who long’d to see the same hungarian, And note his feeding.
1632		D. Lupton London and the Countrey Carbonadoed 12: The middle Ile [of St. Paul’s] is much frequented at noone with a Company of Hungarians, not walking so much for Recreation, as neede.
1822		R. Nares Gloss. (1888) I 440: hungarian. A cant term, probably formed in double allusion to the freebooters of Hungary, that once infested the continent of Europe, and to the word hungry.