Out of (the) Pocket + Ottawa accent
Pocketbook=purse=handbag.
But now that you have me thinking about it...pocketbook is a stupid word for something that holds your wallet/checkbook/glasses. As I recall it's an older term that was used more for the clutch type purses. Maybe your coworker has a clutch/wallet and she calls it a pocketbook. Is she old?
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