Sittin’ on a fence post chomping on my gum
( chomp chomp chomp)
Playing with my yo yo
When along came Herman the worm
And he was THIS big
And I said ” Herman WHAT happened?”
And he said ” I ate my sister! ”
The next 3 verses substitute in brother, mother and father.

The final verse is as follows:
Sittin’ on a fence post chomping on my gum
(chomp chomp chomp)
Playing with my yo yo
woo woo
When along came Herman the worm
And he was this tiny
And I said ” Herman what happened?”
And he said ” I burped.”