The song's lyrics are about KSI's success in his YouTube, music and boxing careers and how he is not to be messed with.

The song's lyrics are about how KSI is killing the game in more ways than one and when he puts his mind to something, he normally succeeds.

This song is a reminder that KSI quickly evolved from a YouTube sensation, to a boxing champion, to a bonafide, respected music artist.

"[5] Speaking on Aiyana-Lee's contribution to the track, KSI remarked, "She's a wild one.

Wynter liked how "KSI creates a playful vibe, flexing during his verses" and she praised Aiyana-Lee's "catchy chorus".

[1] Sarah Akomanyi of Link Up TV remarked that "KSI's confidence is hard to miss through [the song], which makes for clear and consistent verses".

[11][12][13] The music video stars KSI and Aiyana-Lee as a pair of criminals who commit a heist.

[14] In the United Kingdom, "Killa Killa" debuted at number 27 on the UK Singles Chart and number 15 on the UK Hip Hop and R&B Singles Chart, with first week sales of 15,853 track-equivalent units.