Kent Davis!

I remember THAT song! I was also in 4th grade-ish (1972+/-) at an American school in Lagos, Nigeria of all places! The words were written right out in the class songbook. And by today's standards about as un-politically correct an elementary school song as you can imagine .... very catchy, I've googled the 'eck out of the internet trying to find it. The few words I do remember (almost clearly) are ...

Baizan (or Beijan) boy, go back to your bornin' country
Small Island boy, go back to your bornin' country
You come to my house and eat all my food
Leaving my father in a very bad mood
Baizan boy, go back to your bornin country ...

There were more borderline insulting (rhyming) lyrics, but I can't remember them right now - thanks for confirming that I'm not imagining things!