The final stanza:

Had ye but seen the sad plight I was in,
Ye'd not seen such a poet amongst twenty.
I've nothing that's full, but my shirt and my scull,
For my pockets and belly are empty.
Fall all de rall, &c.

The 11th ed. of Tea-Table (1750) had the song too, with "Fall all de rall, &c." after each stanza. That's the earliest ed. I have access to, via ECCO - like The Charmer.