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to suddenly, and unexpectedly, do a bunk from your normal everyday life. Usually to another country as per the 1989 film Shirley Valentine.
Office worker "I haven't seen Karen in Finance for a while..."

Boss "Off the record, not coming back. She's left her husband, gone to Spain."

Office worker "Didn't think she had it in her to do a shirley"
by Dentinox October 19, 2007
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