Bubble gum is a sweet substance similar to chewing gum. You can blow it out of your mouth so it makes the shape of a bubble.
I got bubblegum on the seat of Nanna's car. [+ on]
bubble gum in British English
noun
1.
a type of chewing gum that can be blown into large bubbles
2. slang
a.
crassly commercial pop music aimed at the very young
b.
(as modifier)
a bubble-gum hit
bubble-gum in British English
(ˈbˈbʌblɡʌm)
modifier
for kids
a bubble-gum hit
bubble gum in American English
US
1.
a kind of chewing gum for blowing large bubbles
2.
a kind of rock music with simple lyrics and melodies that is directed at teenage and younger audiences and variously regarded as insipid, unimaginative, unsophisticated, etc.