Why Is Dana...

[Lamplighter]

This link gives several (sort of academic) derivations.

But given my "through the looking glass" mentality,
I've assumed the association has to do with a woman's period.
Likewise, the words and phrases such as "ruddy" and "ragged on".

Thus:

"When I use a word," Humpty Dumpty said in rather a scornful tone,
"it means just what I choose it to mean -- neither more nor less."

"The question is," said Alice, "whether you can make words mean so many different things."

"The question is," said Humpty Dumpty, "which is to be master - - that's all."

(Through the Looking Glass, Chapter 6)

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