Green’s Dictionary of Slang

quiddish adj.

[ety. unknown]

good-natured.

[UK]Life and Character of Moll King 12: We had ne’er a Queer Cull, a Buttock, or a Porpus, amongst them, but all as Rum and as Quiddish as ever Jonathan sent to be great Merchants in Virginia. [Ibid.] 24: Rum or Quiddish, Good-natur’d.
[UK]G. Stevens ‘A Cant Song’ Muses Delight 177: She said I must love you, you’re quiddish and bold.