A nigga who isn't just a regular thieving, murdering son of a bitch but who goes one step further. They are the lowest of the low, essentially worth about as much as a piece of dirt.
This is a combination of the words nigger and cunt. It is mainly offensive to black women, however, since nigger and cunt are arguably the most offensive words in the english dictionary. Because it is so offensive, saying niggunt will magically create a train full of PC millenials appear, and they will kill you on the spot. If you are too much of a pussy to commit suicide, just say this word so you won't have to do it yourself.
Black Woman: "Stay the hell away from my child! You can't touch them!"
Me: "Niggunt"
Me: *dead*
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.