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1.
To shit with a force that can damn near obliterate the toilet you're sitting on. Usually the climax of trying to desperately find a place to defecate. Ultra blasts can happen in someone's pants, but then they are called "fucking ultra blasts." This phrase is usually shouted or screamed.
"Fuck this line! I need to ultra blast..."
"I had to leave the stage for an ultra blast."
"FUCK! I just FUCKING ULTRA BLASTED in my FUCKING PANTS! GOD DAMMIT!"
by disnywhite June 23, 2009

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