Top Definition
An event in which someone will stop doing anything because they need to drop a deuce within the next 30 seconds whether they're ready or not.
PERSON 1: "Why did Ron jump off the mechanical bull so quickly and waddle over to the bathroom?"

PERSON 2: "Those street tacos he ate earlier in Tijuana gave him a shimergency."
by Nick, the Mob Stopper May 19, 2008
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