When you prolong the urge to defecate until the last possible minute and then when you finally sit on the toilet you forcefully grunt to expel the fecal matter creating a “blap” sound that echoes from the toilet.
During the ride home from Panda Express, Dave new a power blap was imminent.

Dude I just power blapped so hard it sounded like a tuba in the toilet!
by Big and Weird May 30, 2021
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