The song you are thinking of is 'Geronimo' by Australian pop group Sheppard. The lyrics, rather than "so say jurambo, say jurambo, say jurambo, say jurambo, bombs away bombs away bombs away," are actually "Can you feel my love? Bombs away, bombs away, bombs away, say Geronimo!"
Sheppard are from Brisbane, Australia and take their name from the three Sheppard siblings, Amy, George and Emma, who form half of the band's line-up. Their song 'Geronimo' is the first single released from the band's first album Bombs Away, an eleven track album which was awarded four out of five stars by Rolling Stone magazine. You can find the full lyrics to the song here. Sheppard followed up their hit with the single 'Something's Missing' and also released an EP, Sheppard, in 2012.
A Number One Hit in their Homeland
'Geronimo' reached the top of the charts in the group's native Australia, the first home act to do so for two years, and the first native indie band to hit number one for ten years. The single also went triple platinum. Sheppard embarked on their first European tour in summer 2014 and are sure to play their biggest hit when they play at the V festival in England in late August 2014. Here's the official video for 'Geronimo:"