Green’s Dictionary of Slang

1. a man’s girlfriend or mistress.

1821–6		‘Bill Truck’ Man o’ War’s Man (1843) 97: The never-ending merry stories of [...] my fancy-girl of Gosport.
1841		Flash (NY) 26 Sept. n.p.: We shall vist your sins upon your fancy girls, and your next of kin.
1846		South Australian (Adelaide) 15 May17/4: [from London press] Beggars tramp about from town to town [...] Every tramper is accompanied by his fancy girl or his wife.
1857		Goulburn Herald (NSW) 13 June 7/5: [T]he prurient slang of the fancy girl of some young thief.
1862		W. Cunningham Glen Snowden’s [...] Magistrates Assistant 107: His ‘jomer’ or fancy girl was also tried. [Ibid.] 114: My fancy girl stood close by me and screened me from observation.
1862		Morn. Post 18 Dec. 3/3: His comforts near — his fancy lass / His bull-pup, black and tan.
1874		Derbyshire Courier 12 Dec. 7/1: Local Flash language [...] jomer — a fancy girl.
1892		H. Nisbet Bushranger’s Sweetheart 31: A fancy girl of mine [...] found them [i.e. boots] rather tight and small for her tootsies.

2. (US) a prostitute.

1834		‘The Pensioner’ in Flash Minstrel! in Spedding & Watt (eds) Bawdy Songbooks (2011) I 100: The only way to come it flash, / Is, to get a fancy gal.
1855		C.G. Parsons Inside View of Slavery 182: You know she is a high priced fancy girl.
1914		Sydney Sportsman (Surry Hills, NSW) 29 July 3/2: But they never make a bloomer / Picking out a fancy gall.
1931		A. Bontemps God Sends Sun. 65: Della was one of the youngest and best-looking fancy girls on Targee Street.
1949		A Key Wrath and the Wind 117: Most times when a man wants him a fancy girl, a prime first-rate one, he goes to a dealer.
1953		A.J. Liebling Honest Rainmaker (1991) 24: He had bribed a fancy girl to wheedle the formula from the Boston Club bartender.
1961		Ty Cobb My Life in Baseball (1993) 131: You do see the old-timers sketched as hooligans with a fancy girl on either arm.
1973		D. Ponicsan Cinderella Liberty 134: It took two New York fancy girls to separate him from his shipping-over pay.

3. (W.I.) a materialistic woman.

1995

Francis-Jackson Official Dancehall Dict. 19: Fancy-girl material girl (à la Madonna).