When one is in the transaction of changing classes and lets out their fart to where they can't be heard or smelt because of the movement and noise around them. Is a play on of the words "Hall pass".
Dude I was so bloated last class that I thought I was gonna blow, but luckily I made it to the bell and let out my hall gas.
by Benny Boy Incred April 24, 2011
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