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1.
Used to describe or explain someones head exploding. Commonly seen in gore films, a Headsplosion is usually the single goriest act achieved in the dispatching of a person or character. The word comes from the simple shortening and combination of head and explosion. Some notable cinematic Headsplosions have occured during a particularly grizzly scene in New Line Cinemas 'Final Destination 3', in which a pair of weights cause the character Lewis to experience a Headsplosion.

The word 'headsplosion' and its definition is the intellectual property of its creator Callum Padgham.
'What a gnarly headsplosion'

'That person just headsplosioned all over that gutter'

'My mother died yesterday'
'Oh gosh, i am so sorry to hear. How did she die?'
'A headsplosion'
'Oh.'
by Callum Padgham February 15, 2007
 
2.
When you cause someone's head to explode by any method.
Examples:
Ganondorf's side special in Super Smash Bros. Brawl
Getting a head shot with a high caliber sniper rifle or shot gun.
When a chestburster Alien gets lost and pops out someones head.
Sticking c-4 to someone's forehead with Snake in Super Smash Bros. Brawl.
Headsplosion is the best way to finish people off in stamina mode

I got an awesome headsplosion with my 50-cal

Ewww, that little alien just splattered his brain with a headsplosion
by Xenomorph42Q May 13, 2008
 
3.
Used to describe or explain someones head exploding. Commonly seen in gore films, a Headsplosion is usually the single goriest act achieved in the dispatching of a person or character. The word comes from the simple shortening and combination of head and explosion. Some notable cinematic Headsplosions have occured during a particularly grizzly scene in New Line Cinemas 'Final Destination 3', in which a pair of weights cause the character Lewis to experience a Headsplosion.

The word 'headsplosion' and its definition is the intellectual property of its creator Callum Padgham.
'What a gnarly headsplosion'

'That person just headsplosioned all over that gutter'

'My mother died yesterday'
'Oh gosh, i am so sorry to hear. How did she die?'
'A headsplosion'
'Oh.'
by Callum Padgham February 13, 2007