Infra-red all inside your bumbo, rasta
Pun on red here. “Bumbo” is jamaican for ‘cunt'
Bumbo means backside. He’s saying his gun is aimed at your ass (probably not literally — that would be weird). Just some JA slang to fit with the rasta reference.
To help improve the meaning of these lyrics, visit “Ice Water” by Raekwon (Ft. Cappadonna & Ghostface Killah) Lyrics and leave a comment on the lyrics box