Basically the word Niger, but spelt in a way that soyboys feel isn't offending anyone.
The word is spelt with a gh to make the "aih" sound, and the J is to replace the G, which makes the word similar to a derogatory term against black people.
Ex. 1: The country of Nighjer borders the country of Chad.
Ex. 2: Shut up you stupid nighjer! *proceeds to be beaten up by gang members*