fabulous drop, n. — Green’s Dictionary of Slang

fabulous drop n.

[the comparison is with a good drink, ‘a good drop’ (of liquor)]

(Aus.) an attractive young woman.

1957

‘Nino Culotta’ They’re a Weird Mob (1958) 46: Dennis and Pat knew a couple of ‘fabulous drops’ that they were going ‘ter take ter the pictures’.