Top Definition
n. An escalating cascade of destruction initiated by a poorly thought-out action.

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If you touch the vena cava with that scalpel we will be here all night dealing with the erupting harmageddon.
by gelpy1 December 27, 2014
1 more definition
n. Confrontation in which hurt, physical or psychological, of Biblical proportion is inflicted one's opponent. Often used in jest or in sporting circumstances.

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Yo! This weekend me and my crew are going to lay some harmageddon on you. You hear me? You will cry!

You know it's just a chess match, right?

Whatever dude. Just bring your tear-proof pawns.
by gnostic 1 October 02, 2013

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