Possible Clues:

• Carpenter's "Do"?
• Carpenter's 'Do'?
• Words to avert bad luck
• 'Rap' song of 1966
• Ward off bad luck
• Good-luck expression
• Superstitious good luck rap
• What some do for continued good luck
• Grow old trees to ward off ill luck
• Handling offence, court finally seemed to hope for luck from America