When I lived in RSA I only ever heard it in Afrikaans, but we "souties" (derived from the Afrikaans for salt - one foot in S. Africa, one foot in UK, and certain bits of anatomy dangling in the salt sea) had our own version. I know it isn't what you're looking for, but here it is:

Sarie Marais is in the family way
And they're trying to put the blame on me.
There's twenty thousand Japies in the old Transvaal
And they're trying to put the blame on me.

Oh Sarie Marais, Sarie Marais,
She's in the family way.
There's twenty thousand Japies in the old Transvaal
And they're tying to put the blame on me.

Not much, I know! I think it may be an old soldiers' song. Maybe it goes back to the Boer War. Somebody is bound to know. The tune is often heard as a military march, and I have heard it played on brass band radio programmes.

mouldy

ps I don't, and never have possessed those certain bits of anatomy!