Clap! Snap! the black crack!
Grip, grab! Pinch, nab!
And down down to Goblin-town
  You go, my lad!

Clash, crash! Crush, smash!
Hammer and tongs! Knocker and gongs!
Pound, pound, far underground!
   Ho, ho! my lad!

Swish, smack! Whip crack!
Batter and beat! Yammer and bleat!
Work, work! Nor dare to shirk,
While Goblins quaff, and Goblins laugh,
Round and round far underground
   Below, my lad!

This song from The Hobbit was sung by goblins of the Goblin-town after the capturing of Thorin and company.

Despite simple structure and grammar, this text is very challenging to translate because of rich lexicon. I had to add several new words to Nûrlâm's dictionary. However according to Appendix F to LOTR, orcs of Moria and Misty Mountains spoke Westron and not Black Speech. So this is just translation exercise and not an attempt to reconstruct this song in the native language of goblins.