Green’s Dictionary of Slang

a prostitute.

1654		E. Gayton Pleasant Notes II v 57: Beside the Fustybeggs, the Dowdees [...] the Maukins, the Fussocks, the Trugmouldies, the Funcos; all which were Faulen sluts, like Bartholmew Faire pig-dressers.
1699		N. Ward London Spy VI 131: Over-against these stood a parcel of Trugmoldies, Straw-Hats, and Flat-Caps.
c.1810–20s		Art of Pickpocketing (1992) n.p.: On the Fleet Bridge, trugmoldies in straw hats and flat caps sold socks and nightcaps and plum puddings.