it means "Ali kill him!". At the Rumble in the Jungle in 1974, when Muhammad Ali fought George Foreman, the crowd was pro Ali, so they were shouting "Ali boma ye" (boma = kill; ye= him) but today many English speakers misspell it as bumaye or bomaye. However, it's not one word, it's indeed two words.
A amazing British Indie band from Crouch End made up of four amazing guys called Jack, Suren, Jamie and Ed.
They are literally the only band that I can describe as 'beautiful'. Their album 'Flaws' is absolutely breath-taking and their first album 'I Had The Blues But I Shook Them Loose' is equally as epic.
If you havent heard of them, give them a listen; they are beautiful <3