Green’s Dictionary of Slang

(US) a sexually promiscuous woman.

1939		B. Appel Power-House 31: She’d come out of the Brooklyn streets, a good-time Madge, easy for every pair of pants.
1943		Life 20 Dec. 102: Soldiers and sailors call them...‘round heels,’...‘chippies,’ ‘good-time Janes,’ and...‘Victory Girls.’ [HDAS].
1960		J. Carpenter Youngest Harlot 89: She was heartless, a goodtime Jane, with everything for a laugh [HDAS].