What is geekjack?

As an AI language model, I don't have much information on specific entities or websites as I am not able to browse the internet. However, it is possible that "GeekJack" refers to a brand or company that specializes in selling products or services related to technology, gaming, or other aspects of modern geek culture. This could include online marketplaces for electronics, apparel, collectibles, or even events and conventions catering to geek interests. Without additional context, it is difficult to provide more specific information on what GeekJack is or does.