spontaneous human combustion 

to suddenly, and with no apparent reason, burst into flames and within minutes become a human cinder. a.k.a. SHC

defoe was running so fast towards the opponents penalty area that he suddenly suffered an acute spontaneous human combustion

spontaneous human combustion by theWestHamfan November 4, 2003

spontaneous human combustion 

The occassion when a human being may spontaneously burst into flame with no external interference. Generally happnes to the aged. Most victims do not survive, and combust when alone. Therefore, there are not many witnessess to spontaneous human combustion, or S.H.C.
However, there have been people who have suffered S.H.C and survived, albiet for only a short while afterwards.

S.H.C does not tend to leave much in the way of bodily remains; most victims leave just the lower leg, a singed hole in the floor, and a pile of greasy ash.
Reasons for this are still only theories, but the extreme heat required to reduce a human body to ash in the space of minutes is intense, and the flames act unaturaly.
In one such case, an elderly doctor spontaneously combusted whilst at home alone. When found, his kneecap and ashes where in the basement, and his foot and slipper left on the lip of the hole on the floor above. His aluminium walker, that should by all means be a puddle of molten metal, was fully intact, including the rubber tips.

S.H.C is not a proven phenomena, and is not a recognized cause of death.

The old doctor apparently died when he spontaneously combusted. Many blamed the phenomena, spontaneous human combustion for his unnatural death.

spontaneous human combustion by Roadie Farla May 22, 2007

Spontaneous Human Combustion 

When a person, or Republican, randomly bursts into fire.

"Spontaneous Human Combustion can strike anyone, anytime, any--sic"

Spontaneous Human Combustion by Jacob The Just December 28, 2005

Preventing Spontaneous Human Combustion

To let one rip
First coined on the hit show:south park

ex:

Man:Dude that was sick it smells like eggs...
Dude:Hey man just preventing spontaneous human combustion here...

Preventing Spontaneous Human Combustion by Fucktarded Scarecrow August 1, 2009