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1. A joke that starts early in the evening, and slowly builds into epic proportions over the night amongst all partygoers, until the slightest mention of a key phrase, name, or sound from the joke sends everyone into all encompassing fits of laughter.

2. A sudden arrival or occurrence of overwhelming quantities of laughter.
Still primed from repeated and escalating jokes on the subject, the mere mention of the word "poo-tato" sent the crowd into an uncontrollable laughalanche.
by DocNonstop December 03, 2016
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