Green’s Dictionary of Slang

a young woman.

1812		Vaux Vocab. of the Flash Lang.
1845		E.J. Wakefield Adventure in N.Z. I 319: A woman [was called] a ‘heifer’ [...] A girl a ‘titter.’.
1859		Hotten Dict. of Modern Sl. etc.
1864, 1867, 1870		Hotten Sl. Dict. 258: Titter a girl; ‘nark the titTER,’ i.e., look at the girl. ― Tramps’ term.
1882		Sydney Sl. Dict. (2 edn) 6: ‘Nark the titter,’ watch the girl.
1887		W.E. Henley ‘Villon’s Good-Night’ in Farmer Musa Pedestris (1896) 174: You sponges miking round the pubs, / You flymy titters fond of flam.
1895		Crowe Aus. Sl. Dict. 86: Titter, a girl.
1900		Truth (Sydney) 28 Oct. 5/5: The titter screams, & holds ’im closer / Fallin’ in a faint away.
c.1900		‘Ramrod’ Nocturnal Meeting 47: I was only a titter, not as old as Ethel here, when I fell madly in love with my husband.
1905		Sun. Times (Perth) 3 Sept. 1/5: He brightens up the dreary intervals of spruiking by ogling the girleens [and] the frisky titters send back many an unfilial wink at the amorous ancient.
1913		Sport (Adelaide) 8 Mar. 12/1: They Say [...] That Wesser O and Bill G are seen a lot at the Semaphore lately. Is it the water they're after or the ‘titters.’ Must be the girls as they don’t like water .