What the heck is a shoomba? It sounds like it could be related to voodoo? I just did a google search, and here's some info:

http://www.urbandictionary.com/define.php?term=shoomba
shoomba

to ward away evil spirits,said load and long as one wave his hands in front of said object person.known for getting
rid of bad juju.can also used to start faulty machinery.or shut up x wife
shoomba,jb said to the evil x juju

Hey, who needs the authority of Christ when you can have shoomba? Here's another interesting find -- a link on google books for a book about Muslims in India:

CHAPTER XVI Concerning the Tayra tayzee or the first thirteen evil days and the Akhree Char Shoomba kae Eed or feast held on the last Wednesday of the second month Suffur Qanoon-e-Islam or, The customs of the Moosulmans of India; comprising a full and exact account of their various rites and ceremonies, from the moment of birth till the hour of death By Jaʻfar Sharīf, Gerhard Andreas Herklots

Here's another one, from the book on Google: The No-nonsense Guide to Indigenous Peoples -
http://books.google.com/books?id=VFRft8e1vtgC&pg=PA73&lpg=PA73&dq=shoomb...
"But he had an exotic array of props in front of him [speaking of a shaman]-- two crystal skulls and a child's nightlight shaped like a serpent... oomba, woomba, shoomba, he droned, while one of acolytes explained that he was invoking the god of fire.

So, whatever the heck it is, I don't think it's scriptural. I suspect there may be a character in a game or tv show with that name that kids can relate to, but I don't know?