"Shag" is one of those words with a double life, with perfectly polite meanings lying alongside the wicked one:

The common cormorant or shag
Lays eggs inside a paper bag.
The reason you will see, no doubt,
It is to keep the lightning out.
But what these unobservant birds
Have never noticed is that herds
Of wandering bears may come with buns
And steal the bags to hold the crumbs.

Another like that is the American way of spelling arse, as ass. "Kick ass" always sounds an unkind thing to do to the poor animal.

You can get it with names too - I posted a story a little time back about an English explorer called Sir Vivian Fuchs.

Soon after returning from his trans-Antarctic journey in 1958, he was given a civic reception by the mayor of Leeds.

In the speech of welcome, sopeaqking in broad Yorkshire , every time the mayor referred to the guest of honour he called him "Sir Vivian Fucks". Finally he decided to intervene. He leant forward and whispered "Actually, it's pronounced FOOKS."

The mayor looked shocked "Oh no, we can't have that sort of language here! There's ladies present!"

Waterford sept I suppose it is Frank (though we never had much to do with Waterford Glass that I heard of -. Just the stuff they sometimes put in it). But always Tipp for the hurling!