1. [1950s] (Aus.) a stone [? one plucks it from the ground].
2. [1960s+] (US black) wine, esp. cheap wine [? SE pluck, to harvest grapes].
3. [1960s+] (US black) an attractive woman [she is ‘plucked’ from the bunch; or ? ref. to fig. use of SE pluck, offal, i.e. the vagina].
[1960s] (US black) an habitual wine drinker.