1. Noun. Created as a search term for a google search engine optimization challenge in which the page with the highest rank on google at 1:00 AM GMT on January 1, 2005 will win $1,792.
The origin is believed to be tied to the seo term nigritude ultramarine.
www.seraphim-proudleduck.info hopes to win $1,792 in the seraphim proudleduck challenge.