Green’s Dictionary of Slang

1. (orig. US) a nymphomaniac, an allegedly sexually insatiable woman.

c.1910		in Merriam-Webster’s Collegiate Dict. (1998).
1939		H. Miller Tropic of Capricorn (1964) 98: Laura the nympho brandishing her cunt.
1946		H.A. Smith Rhubarb 47: That daffy nympho Myra.
1959		H. Ellison ‘Sally in Our Alley’ in Gentleman Junkie (1961) 122: Aggie [...] has one small character flaw: she’s a nympho.
1963		K. Waterhouse Jubb (1966) 27: How’s that nympho of yours getting on, eh?
1967		J. Hibberd White with Wire Wheels (1973) 185: What about the line-up of harlots you’ve inflicted us with! Roaring nymphos.
1975		R. Macklin Queenslander 10: My brother went up her like a rat up a drainpipe. She’s a nympho.
1979		D. Gram Foxes (1980) 79: I may have slept with a few guys [...] But I’m not some total nympho.
1987		‘Joe Bob Briggs’ Joe Bob Goes to the Drive-In 89: Where are the little nymphos who provide the raw meat for the slasher?
1996		Penguin Bk of More Aus. Jokes 108: She’s a nympha. And what with kissing her and screwing her, I was up and down all night.
2005		Mad mag. May 53: [...] the loveable ditz, the oversexed nympho, the career woman struggling with motherhood.
2010		J. Ellroy Hilliker Curse 9: Chris was a nympho. She flashed her snatch.
2021		J. Ellroy Widespread Panic 22: They sold Spanish fly to a nervous nympho.
2024		J. Meades Empty Wigs (t/s) 121: I know which I’d sooner have. A well rewarded nympho being porked up every orifice.

2. attrib. use of sense 1.

1970

T. Southern Blue Movie (1974) 155: It’s going to be very tough [...] to keep the lez and the nympho segments under twenty-five minutes each.