Nig time is a phrase used when there is a large group of black males that are ready to either jump a smaller group of white males and or females, or join a fight/brawl of some sort. The phrase is then said loudly by the leader of the group while he is taking his shirt or wife beater off. Preferably a wife beater.
Mike, Tim, Jack, and Susan were playing baseball in the park and got in an argument with some of the African Americans that they were playing with, when a large group of African Americans came out of the apartment complex next to the park and joined in. The leader of the pack stated,"It's nig time" and took off his white T.