What is the meaning of "bubbling forth"?

Rage takes over. Like a black ooze that’s filling me up, spilling out of my pores, covering my eyes. I can no longer see. Or hear. Or smell. The only remaining sense is touch, and all I feel is pain in my fists as they smash into His face. When it becomes too much to bear, I rise to my feet, directing a kick at His skull.
Then another.
And another.
Each blow comes with a name, bubbling forth against my will. I spit them out as if they’re poison, spewing them onto Him, covering Him.
“Janelle. Craig. Amy. Rodney. Betz.”
“Quincy!”
That’s not my voice. It’s Sam’s. Suddenly, she’s right behind me, crushing me under her arms, dragging me away.

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