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Rapidly expanding heat and gas and/or plasma.

Usually caused by chemical or nuclear reactions, but can also have many other causes such as the release of pressurised gas.
Spend a week in baghdad or go to an active quarry for examples.
by waffle October 16, 2003
Happy St. Patties Day!
An explosion may be defined as a loud noise accompanied by the sudden going-away of things from the places they were before.
by iMacThere4iAm August 09, 2006
Happy St. Patties Day!
The process that generally entails taking large objects and turning them into many, many small objects.
The Mythbusters once made a cement truck disappear in a fiery explosion.
by Zazu_Biggs October 04, 2009
Happy St. Patties Day!
What you say after giving someone a highfive as if your high five was so epic it bent the laws of reality and exploded with no negative consequence.
Brandon: "ADRIAN"

Adrian: "BRANDON"

*high five*

Brandon/Adrian in unison: "EXPLOSION!"
by nom nom nom llama brains November 30, 2010
Happy St. Patties Day!