Green’s Dictionary of Slang

an older and/or unattractive woman.

1994		Observer 14 Aug. 21/2: Bit of a Doris, trout, old stinker, old splosher — unattractive women.
2000		N. Griffiths Grits 464: This upset tha doris like an she started tawkin about ow shiz got a son of Colm’s age.
2009		J. Joso Soothing Music for Stray Cats 45: I call her Doris, though that isn’t her name, its just what I called her that first night on account of her behaving like one, a right Doris.