Victoria Spivey & Lonnie Johnson - Dope Head Blues (1927)

Image retrieved from ebay.com on October 13th, 2013.

Editor - "Dope" is generally referring to opioid drugs. In this case, dope is making the singer feel stronger than a rooster, boast of her riches, and have grandious thoughts regarding the President and the Prince of Whales. I suspect dope here is referring to cocaine.