'til the bubbles pop up

from Dr. Dre (Ft. Eminem & Xzibit) – What's the Difference Lyrics on Rap Genius

Meaning

When somebody is drowning, there will be a jet of bubbles produced from their attempts to take breaths underwater. Pretty nasty, this line

To help improve the meaning of these lyrics, visit “What's the Difference” by Dr. Dre (Ft. Eminem & Xzibit) Lyrics and leave a comment on the lyrics box