The song is a thrilling, aggressive, hardcore electric anthem and heavily samples "Ghost Rider" by Suicide (ca. 1977, buy MP3 here). As my friend Clayton wonders aloud, perhaps the lyrics "America America is killing its youth" in the Suicide song influenced the visuals in the M.I.A. video.
At the risk of spoiling the video for first-timers (and making too much light of the themes of racism and militarism it addresses), I will say only three words: global ginger jihad.