leslie, n. — Green’s Dictionary of Slang

leslie n.

also Leslie Anne

[abbr. + a name that serves for men and women]

(Aus.) a lesbian.

a.1950		note in S.J. Baker papers MLMSS 165: Box 3: Leslie - a lesbian.
1966		Trimble 5000 Adult Sex Words and Phrases.
1972		B. Rodgers Queens’ Vernacular 125: lesbian [...] les; les-be-friends; [...] lesbo; lesby; les girls [...] Leslie [-Anne]; lessie; [...] lezbo; lez; lezzy.
1982		Maledicta VI:1+2 (Summer/Winter) 133: Here are some obsolete or nearly obsolete terms which careless lexicographers continue to list as current […] Leslie Anne and Thespian and Marge.
1984		Partridge DSUE (8th edn) 676: since ca. 1945.