A common term used by linguistically challenged african americans, attempting to use the word nigga . Often the female side , usually an attempt to insult one's enemy or sometimes a close friend in a situation which words are barely understandable but have simple meaning. And when in a hurry, if you say nigga fast enough with a your mouth slighty open, the word nigga will sound very much like nekra.
Ay yo nekra, back yo ass offa my man.
Yo you be's triflin' over dis' shit right now, nekra.
Shut uhhp, nekra.