Webster's Revised Unabridged Dictionary
Cf. Icel. gikkr, a pert, rude person, Dan. giek, a fool, silly man, AS. gagol, gægl, lascivious, wanton, MHG. gogel, wanton, giege, fool, and E. gig, a wanton person
Away with those giglets too, and with the other 345 confederate companion!
"Measure for Measure" by William Shakespeare
The laird winna like to see his bride jumpin frae knowe to knowe like a daft giglet, within a week o' her marriage.
"Wilson's Tales of the Borders and of Scotland" by Various