1) American invention 2) Chewing gum 
Bubble gum is a type of chewing gum, designed to be inflated out of the mouth as a bubble. ==History== In 1928, Walter E. Diemer, an accountant for the Fleer Chewing Gum Company in Philadelphia, was experimenting with new gum recipes. One recipe was found to be less sticky than regular chewing gum, and stretched more easily. This gum became highly...
Bubble gum is London Cockney rhyming slang for the buttocks (bum).
[n] - a kind of chewing gum that can be blown into bubbles
noun a kind of chewing gum that can be blown into bubbles