The correct spelling is oompa loompa. These are the dwarf characters that make the chocolate in the film. Here are the lyrics:
OOMPA LOOMPA DOOMPADEE DOO
I'VE GOT A PERFECT PUZZLE FOR YOU
OOMPA LOOMPA, DOOMPADAH DEE
IF YOU ARE WISE YOU'LL LISTEN ME
WHAT DO YOU GET WHEN YOU GUZZLE DOWN SWEETS
EATING AS MUCH AS AN ELEPHANT EATS
WHAT ARE YOU AT GETTING TERRIBLY FAT
WHAT DO YOU THINK WILL COME OF THAT
I DON'T LIKE THE LOOK OF IT
OOMPA LOOMPA DOOMPADEE DAH
IF YOU'RE NOT GREEDY YOU WILL GO FAR
YOU WILL LIVE IN HAPPINESS TOO
LIKE THE OOMPA LOOMPA DOOMPADEE DO
DOOMPADEE DOO
For those that don't know, this is what they look like!
Boo!