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As referenced in the Siouxsie and the Banshees song, "Night Shift," "Night Shift Sisters" are prostitutes, as they are known for working at night, and are, for the most part, females who have built a sense of camaraderie, or sisterhood.
My Night Shift Sisters
Await your nightly visitor
They don't bother me
No they don't bother me

My Night Shift Sisters
With your nightly visitor
A new vocation in life
My love with a knife

"Night Shift" ~ Siouxsie and the Banshees
by JuniperTreeGrammarNazi April 27, 2014
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