Racial slur; a contemptuous term for a Black person. The word nigger was first used as an adjective denoting a Black person in the 17th century and has had strong offensive connotations ever since. It remains one of the most racially charged words in the language.
Ironically, it has acquired a new strand of use in recent years, being used by Black people in referring to other Black people. Also known as the n-word. Nigga is a variation of nigger that also has gained traction in recent years. It is used frequently in entertainment culture, especially in rap lyrics and comic stand-up routines. Some people consider it altogether different than nigger, considering it a term of affection or just neutral. Many still consider it a slur, no matter the spelling. Do not use unless there is an extremely compelling reason to do so, and a supervisor approves it.