Top definition
A very loose uncontrolled movement of the bowels whilst within the time period whose limits are defined by:
a) Handing your boarding pass to the gate agent
b) Taking your seat on a commercial airliner.
"Well, I was just getting on Onur Air flight 711 to Dalaman when I suddenly had a huge spout of boarding diarrhea!"
by Sheeeeeaaaaaaaannnnnzzzzzz August 31, 2007
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