The rib is the shell
And a heart is the yolk
And I just made a meal for us both to choke on
She compares her body parts, namely her ribs and heart, to the fragility of an egg. Only by cracking the egg, and subsequently breaking her own heart, can she create a scenario where it is appropriate to part ways. Essentially, she is torn with this decision and no matter how she goes about it, it will hurt both parties.
In the liner notes to The Idler Wheel Fiona writes “Yolk/Yoke”, indicating she wishes to give the word a double-meaning
A “Yoke” is a burden of sorts,a wooden beam worn by oxen to enable them to pull together a load.
NOte, however that the animals usually work in pairs, just as the head and heart must do
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