A small town, or small subsection of a town, predominantly filled with young families and their babies, identified by the high number of cloth nappies hanging from the clotheslines.

Often filled with families from a lower economical bracket.

Nappy comes from napkin, or cloth napkin, the article used most frequently to cover the bottoms of babies before commercial disposable nappies/diapers became available.
"Where are you from?"
"I grew up in Nappy Valley."
by g.blake May 04, 2014

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