Here it is, copied over from yesterday's revived "Biddy McGrath" thread that most people seemed to have missed:

Now I'll tell you a story that it bound to shock

It's all about a murder on the Rings-end Dock.

I'll tell the story of Biddy McGrath

Who strangled two sailors with the straps of her bra.

With me toor-i-aaa, fol-the-diddle-ahh

Toor-i-oor-i-toor-i-ahh.

They tried to dope her with foreign liquor

But even at that they couldn't lick her.

She remembered she was told by her Ma and Da

To keep both of her hands on the straps of her bra.

She put the straps of her bra around the big fella'neck

And tossed him in the Liffy like a crust of bread.

Then the small fella came up and said 'Hee-Haw'

So she stuffed his gob with the rest of her bra.

She went home that night about a quarter to one,

Happy and contented with a job well done.

She told her story to her Ma and her Da,

They said 'Thank God that you wore your bra.'

Now come all you young girls who like a sailor by night,

Never wear the straps of your bra too tight.

Remember the story of Biddy McGrath -

Keep both of our hands on the straps of your bra.

(From "Ballads from the Pubs of Ireland" - originally posted on Mudcat on the Biddy McGrath thread)