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The unfortunate circumstance when a group of individuals is trapped in an enclosed space (train, plane, bus) and one of them (usually unknown and having recently ingested a burrito or cup of chili) breaks wind, creating a cloud of misfortune for all involved.

Closely related: Dutch Oven
A: "Hey dude, I bet you it was one of those girls that started the Mexican Christmas Party on the train yesterday."

B: "Ayeeeeee - who farted? I walked right into a Mexican Christmas Party!!!"

by Mariano Webster October 17, 2008
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