What Is A Bubu?

In comedian Allan Sherman’s song, “Chim Chim Cheree”, (a clever satire of American advertising  based on a Sherman Brothers’ song from Mary Poppins) on the record My Name is Allan, the line “And I sharpen my bubu, and use it to shave” , causes peals of laughter from the audience, but does anyone know what a bubu is?IMG_4689