Thanks all. Between the few versions I saw posted here (under different names) and listening to the track over and over, I was able to get almost all the lyrics from this Sean O'Neill recording. Previously I could only understand about 50% of them. I'm only missing a couple phrases now.

Here's the (almost complete) Sean O'Neill version from the 1976 Bay Records "Live at the Plough and Stars" release:

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Johnny Daddle Dum

Oh there was a little man, And he had a little lass
And he [...............], N' ridin on the grass

Chorus
Johnny Daddle Dum, Daddle Dum
Oh, Johnny Daddle Dum-a-dee

Well he rowed and he rowed, And he came to a brook
And he spied a little fisherman, A fishin' with his hook

Chorus

O, fisherman, O, fisherman, And how dee-a-dee
Have you a little cod fish, You can spare me?

Chorus

"Oh, no" cried the fisherman, The well has been dra
Been fishin' all day, And I've only caught a crab

He got a little hook, And he slipped it up his bone
Then he put o'er his shoulder, And he fucked off home

He couldn't find a hole, And he couldn't find a dish
So he stuffed it in the pot, Where maidens have the piss

In the middle of the night, the maid she got a fight
She had the [.....], [............................]

Well she sat on the bowl, and she began to grunt
The dirty little bastard, He got her by the "Johnny Daddle dum...etc"

O master, O master, As sure as you were born
The Divil's in the piss pot, stickin' up his horn

Well one grabbed a brush, And the other grabbed a broom
And they beat the little Bastard, All around the room

Well they beat him in the middle, And they beat him in the side
And they beat him in the back, Till the poor fucker died

Well the moral of the story, And the moral is this
Don't put your crabs, Where the maidens have the piss