Sweet, perky, or youthful.
Tasting like bubblegum.
A type of pop music marked by sweetness, pep and charm (rather than depth or complexity).
A light pink colour, like bubblegum.
A sweet chewing gum formulated to be stretchy so the chewer can blow bubbles with it.
Overly simple.
In a manner that simplifies a concept or issue so that its nuance and complexity are lost or important details are overlooked.