Burp? Black holes don't just burp gas if it builds up.
okay
First off, the star uses up all of its resources, and thus cannot equal out the massive amount of mass closing in on the center. The HUGE build up of matter in the center causes a "singularity" in the middle of the star. Massive amounts of hot gas swirling around the puny singularity is sucked in, the singularity cannot hold all of it, forcing it all out of the sides in massive "gamma rays" of hot energy.