Definitions by Chris A!

nig ice 

The figurative barrier that prevents people from using racials slurs when conversing with people they do not know very well.

Example 1: The conversation was stifled and boring, until someone broke the nig ice. After that, everyone was able to relax and spout idle racism.

Example 2: I wanted to tell that hilarious racist joke I had heard, but no one had yet broken the nig ice, so I wasn't sure how well it would go over.

nig ice by Chris A! October 10, 2006