Green’s Dictionary of Slang

a promiscuous woman.

1517		Skelton Elynour Rummynge line 538: Than sterte forth a fysgygge And she brought a bore pygge.
1573		T. Tusser Five Hundred Pointes of Good Husbandrie (1878) 169: Make maide to be clenly, or make her crie creake, and teach hir to stirre, when hir mistresse doths speake. Let hollie wand threate, Let Fisgig be beate.
1596		S. Gosson Pleasant quippes for upstart newfangled gentlewomen 13: For when you looke for praises sound, / Then are you for light fisgiggs crownd.
1841		D. Boucicault London Assurance in London Assurance and other Victorian Comedies (2001) Act III: Fizgig! The devil!