Just to mention it. If a rapper is saying that he is killing it or killing them, it just means that he is better, greater or faster than the rest or simply very good at something.
Although something like that is said in the last clip, it is of course not about really killing anybody, especially that song and video were just produced in order to misuse a german car and to sell it afterwards for charitable purpose, as can be seen in the video at 3:15.
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Heavy Metal was something like my first big love in the topic area of music.
So let's put that Hip Hop aside for a while and listen to some Metal!