Green’s Dictionary of Slang

a wanton, promiscuous woman.

1546		T. Langley (trans.) Polidore Vergile de Invent. VII vi 140: These [...] be so light fingered and suche rigbies Children that they wil fynde two thynges, afore they lose one [OED].
1607		R. Carew (trans.) Estienne’s World of Wonders A2: Here dwels that towring and terrible Nimrod, that hunting rigsby Semiramis.