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1.
To explosively fart due to massive pressure after attempting to hold it for a long time.
"Oh shit, I'm about to blow a hootie." "Gross, Greg just blew a hootie all over his pants."
by Ralph Wintergreen August 27, 2013
 
2.
Get (getting) pissed off, or about to get pissed off
"I'm about to blow a hootie!" or "Don't blow a hootie!"
by Ned Rutledge July 18, 2013