I can imagine Brian May when Freddie Mercury would come to him with song lyrics: "Oh man, is this another song about a dude?" This song, however, is about a woman, an expensive prostitute.
To avoid complications
She never kept the same address
She spoke just like a baroness
To avoid constipation
She always drank her prune juice
To end conversations
She said she had to drop a deuce
Nice imagery here, eh? This woman drinks prune juice to stay regular, and then when she wants people to go away she just says she has to take a shit. It totally goes against the high-class descriptions in the original.