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, 2005will win $1,792.
The origin is believed to be tied to the seo term nigritude ultramarine.
When a man masterbates and jizzes into a cup before locking it away, so he can therefore keep track of his ejaculation amount, over time. The man may then decide to show a potential girlfriend his produce from his Proudlock to show his capability to ejactulate large or small amounts.
Man of doubious sexuality, but we love him all the same. Famous for "interesting" hairstyles, love of conformity and watching kid's movies. Always has a cigarette to share.