Only to be sang when it's raining to make the rain stop, if it's sang when dry you'll bring the rain.

(leader sings a line, everyone repeats)

Oh a lay a
Perri tici tumba
Maza maza maza
Oh a lu, lua a lu, lua lay

(repeat louder and louder)

I’ll sing you one O,
Green grow the rushes O.
What is your one O?
One is one & all alone & ever more shall be so.
I’ll sing you two O,
Green grow the rushes O.
What is your two O?
Two, two the same to you, how’s your father? Alright!
Three, three the rivals. Boom Boom Boom.
Four for the Gospel Makers.
Five for the symbols at your door.
Six for the six proud walkers.
Seven for the seven stars in the sky.
Eight for the April rainers.
Nine for the nine bright shiners.
Ten for the Ten Commandments.
Eleven for the eleven that went to Heaven.
Twelve for the twelve Apostles.

There were rats, rats
As big as blooming cats
In the stores, in the stores.
There were rats, rats
As big as blooming cats
In the Quartermaster’s stores.

chorus

My eyes are dim, I cannot see.
I have not brought my specs with me.
I have not brought my specs with me.

(Other verses are made up now by others.)
Examples:
Chips as big as battleships.
 

Ging gang gooly gooly gooly gooly
Watcha, ging gang goo, ging gang goo.
Ging gang gooly gooly gooly gooly
Watcha, ging gang goo, ging gang, goo.
Haila! Oh Haila Shaila. Haila Shaila. Haila whooo.
Haila! Oh Haila Shaila. Haila Shaila.. Haila whooo.
Shallywally Shallywally Shallywally Shallywally.
Umpa Umpa Umpa Umpa………