Clean version of the above taught to me at Brownies in the 1970s in England, went something like this:

The bomb went rolling down the street, parley vous;
The bomb went rolling down the street, parley vous;
The bomb went rolling down the street, parley vous;
Knocked a copper off his feet. Inky pinky parley vous

(more verses I dont remember)

Christopher Columbus drinking gin, parley vous;
Christopher Columbus drinking gin, parley vous;
Christopher Columbus drinking gin, parley vous;
Opened his mouth and the bomb went in. Inky pinky parley vous. BANG!

On reflection, probably not very suitable. Dont know its origin, sounds like a parody from WWII.