The act of instant male orgasm upon seeing something insanely hott.
When Lauren and Silvia took their clothes off, Patrick experienced spontaneous cumbustion.
by Sivv Vicious March 23, 2008
The act of two males performing a donkey punch and white dragon in unison on a female during an mmf.
"We gave Dorothy a spontaneous cumbustion last night. Her head exploded and a geyser of blood and cum splattered the walls."
by Gide October 02, 2006
An unexpected ejaculation
Jill was pissed Randy was premature last night. Jill said he suffers from Spontaneous Cumbustion.
by PSpin420 November 01, 2009
Cumming without being aroused and with no sexual provocation.
As the airplane took off, Bob spontaneously cumbusted.
by tanukisanyo May 09, 2005

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