Why Is Dana...

[monster]

Originally Posted by 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:

.

As opposed to a man's period?

I thought it was "By Our Lady" rather than your lady, but the term definitely predates the modernistic view that anything regarding menses can be mentioned in public -as a swear word or not. Ditto the other two. Of course if that's really what you want to believe, no-one can stop you... enjoy your mental images........ (ew)