Version 1:

Scooby dooby doo
Did a poo
Right in Shaggy's slipper
Shaggy put it on
What a pong
It made him shake and shiver.

Version 2:

Scooby Dooby Doo,
Where are you?
Hanging upside down in the ladies loo.

Version 3:

Scooby Dooby Doo,
Where are you?
"I'm half way down the loo now."
How much have you done?
"Half a ton,
And I'm ready to do some more now".

Version 4:

Scooby Dooby Doo,
Did a poo,
Shaggy thought it was candy,
He took a bite
And went all white,
And that was the end of Shaggy.