Top definition
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.
by Chris A! October 09, 2006
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