Green’s Dictionary of Slang

1. an untidily dressed woman, a slattern.

1699		N. Ward London Spy VII 174: A parcel of Scotch Pedlars and their Moggies, dancing a Highlanders Jig to a Horn-pipe.
1801		C. Dibdin Yngr Song Smith 43: Moggy’s affectionate determination of following her lover she had put in verse.

2. a cat.

1900		Marvel XIV:343 June 15: At eleven at night, jest when the moggies begin howling.
1914		E. Pugh Cockney At Home 66: Her back was up in a tick, for all the world like a yowlin’ moggy.
1916		N. Douglas London Street Games 30: Moggies are cats.
1943		M. Harrison Reported Safe Arrival 61: Yer might ’s well try ter keep a old moggie orf of er bit of fish.
1959		I. & P. Opie Lore and Lang. of Schoolchildren (1977) 175: Moggy (cat).
1962		K. Waterhouse There is a Happy Land (1964) 114: All the other kids stood round like tom moggies.
1986		R.G. Barrett Godson 187: Norton stared at the huge cat [...] ‘Peregrine,’ he whispered. ‘Stay here and keep an eye on that moggie’.
1988		Beano Comic Library No. 146 1: Winston The Bash Street School moggy.
1996		(con. 1964-65) B. Thorpe Sex and Thugs and Rock ’n’ Roll 79: A lone moggie picking at a garbage can.
1999		Guardian Guide 3 July–9 July 69: Sammy, an ailing 18-year-old moggy.
2000		Indep. 10 Jan. 18: The top popular moggy names may be headed by Charlie.
2008		Camden New Journal Rev. 11 Dec. 19: The burly moggie did not make the gender swap.
2010		Guardian 18 Dec. 38/3: That’s why he looks like a throwback to ancient Egyptian moggies .
2018		C. Hammer Scrublands [ebook] A moggy called Mr Puss.

3. an unpleasant woman.

1975

A. Bleasdale Scully 93: I’ve actually seen him laughing when he’s given our class to one of those old moggies on the staff that he doesn’t like.