Definition of "flashy"

[…] the accustomed warmth pierced his marrow, and ran thrilling through his shaken bones; just as when at times, with forked thunder burst, a chinky stream of fire in flashy lightning shoots athwart the skies.

1826, Benjamin Apthorp Gould, The Works of Vergil: Translated into English Prose

Indeed, he was 'dithguthted' at his condition; and if upon the occasion just described he had allowed himself to be somewhat 'intoxicated with liquor,' I must aver that I do not recollect another instance in which this worthy little gentleman suffered himself to be similarly overtaken. Now and then a little 'flashy' he might be, but nothing more serious—and rely upon it, this was no common virtue in those days.

1863, Sheridan Le Fanu, The House by the Churchyard