Kill is used a slang word within the dc region mean too put confirmation on something, if you tell a story of what just happened down the street that was unbelievable, someone might ask you say Kill, to make sure you serious..
Benny) man shawty got the fighting her mother down street, slapped her and everything.
I will fucking kill you.(Metaphysically speaking - its illegal to kill somebody in real life. God does not allow murders into heaven - cold blooded or egotistical.
Might be misunderstood as a threat on one's life, thats on them for not continuing learning not you.