Green’s Dictionary of Slang

a pleasing young woman; a term of endearment.

1723		C. Walker Authentick Memoirs of Sally Salisbury 68: His lab’ring Fancy eas’d, / To Prior, writes what’s past, and what’s to come, / Dating the Packet from his Chucky’s Bum.
1787		Burns Lady Onlie in Works (1842) 181/2: Ladie Onlie, honest Lucky! Brews good ale at shore o’ Bucky [...] Her house sae bien, her curch sae clean, I wat she is a dainty chucky.
1865		Leaves from Diary of Celebrated Burglar 71/1: Well, all ryght, mi chucky, thau sal stop and see wat’s goin’ on, and so’ll I.
1918		A. Brazil Patriotic Schoolgirl 76: ‘Right oh, chucky!’.