The title refers to the expensive Reebok Pump shoes that were status symbols in the late '80s and early '90s. Robert, an outcast, targets the kids who have the wealth and social standing he lacks.
The famous chorus— "All the other kids with the pumped up kicks / You better run, better run, outrun my gun" —is a stark warning about youth mental health and isolation. Why the Reggae Version Works
The song is written from the point of view of Robert , an isolated youth with "homicidal thoughts" who is planning revenge against his more affluent peers.
Chilling Grooves: The Irony of "Pumped Up Kicks" (Reggae Version)
In this particular version, the original indie-pop synth-bass is replaced by a warm, bubbling reggae rhythm. The frantic energy of the 2011 original is smoothed over with off-beat guitar skanks and soulful, almost detached vocals, turning a high-tension track into something that sounds, on the surface, entirely carefree. The Dark Reality Behind the Rhythm