an acronym for 'Full Nigger Kit' Which includes (but not limited to) an old shitty car such as a crown victoria, oldsmobile, or caprice etc. with unusually large 'spinnas,' a ridiculously loud and expensive earthquake machine (sound system), and multicolored primer 'paint' job. Other items that may be included in the 'FNK' are gold teeth (also known as grilz), ugly fat women, 'gats', and shwag. FNK's are usually found in close proximity to police officers with night sticks.
That was a genuine chocolate face pulled over in that FNK.