nigtomic bomb
Similar to an f-bomb, a nigtomic bomb occurs when a white person says the word nigger in front of a large crowd of people, usually black, that are likely to be upset by the choice of language, such as during an NAACP convention or at Christmas dinner.
Evan: When I called the man intoducing me at the black history month lecture 'my nigga,' everyone freaked out and left. Total nigtomic bomb.