You had to do it big, but couldn't never stop the work
Now you heard my words and your bubble gonna burst

from Mac Miller – Whateva Lyrics on Rap Genius

These two lines are directed at someone who also makes music, and doubted Mac’s ability to spit(most likely because Mac’s a pretty goofy white kid).

However, after this guy heard Mac rap, he was shocked, and Mac saying “your bubble’s gonna burst” means that guy won’t be so cocky anymore.

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