This article is from the AC/DC FAQ, by Phil Rose acdcfaq@yahoo.com with numerous contributions by others.
[Info taken from 'Shock To The System' by Mark Putterford]
Yes. Bon wrote the song about a huge Tasmanian woman he had shared
a 'wild time' with in Melbourne. Interestingly, the band ran into
her again in Hobart, Tasmania...but she had lost a lot of weight
and Bon was disappointed that she was no longer the '42-39-56' that
he remembered. She did know the song was about her, and took it as
a compliment.
 
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