(sports, particularly NCAA basketball, and some esports, particularly Rocket League) A team on the bubble for an upcoming tournament.

(motor racing) The bottom qualifying position in a race, on the outside of the last row at the starting line.

Full of bubbles. / (informal) Cheerful, lively. / Having the characteristics of bubbles. / (economics) Having the characteristics of economic bubbles.

(informal) Champagne.

(motor racing) Holding the last qualifying position with qualification still in progress, and thus liable to lose that position.

(US, slang) Large, rounded buttocks. / (US, slang) A fat person.

(slang) A stupid person. / (slang) A submariner; bubble-head. / (slang) A navy hard hat or salvage diver (inspired by the shape of the old spun-copper diving helmet).

(Britain, New Zealand) Cabbage and mashed potatoes etc. fried together. / (Cockney rhyming slang) A Greek.

Alternative form of bubblegum

(usually uncountable) A sweet chewing gum formulated to be stretchy so the chewer can blow bubbles with it.