It appears in Google Books under the title Jack Randall's Diary of Proceedings at the House of Call for Genius. Edited by Mr. Breakwindow. To which are added, several of Mr B.'s minor pieces.tony h wrote:One here from A dictionary of modern slang, cant, and vulgar words, used at the present ... by John Camden Hotten
Gig: fun, frolic, spree.
"in search of lark, or some delicious gig,
The mind delights on, when 'tis in prime twig."
from Randall's diary 1820
I'd like to find this diary entry!
However, Google Books names the author as Thomas Moore, who I worked out must actually be Thomas Moore the Irish poet and 'Ireland's national bard' (and hence is not to be confused with inter alia Sir Thomas More, the English councillor to Henry VIII).
The fragment you quoted, Tony, is from a narrative poem that is ostensibly about boxing (but is actually a political allegory), and is absolutely laden with colourful antique slang; but it has at least been annotated with some helpful footnotes by the author.