NKN is an acronym for Nice kid, nice. NKN is gaining popularity as internet slang, however; it stems from common street slang of individuals growing up , namely breakers (break-dancers), in the early 70's in NYC and other U.S. locations which brewed up the lifestyle and genre we now call Hip-Hop.
"That bird just gave me her digits!" 'NKN!'
by Nitrus January 02, 2012