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1.
The act of instant male orgasm upon seeing something insanely hott.
When Lauren and Silvia took their clothes off, Patrick experienced spontaneous cumbustion.
von Sivv Vicious 23. März 2008
25 10
 
2.
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."
von Gide 2. Oktober 2006
12 6
 
3.
An unexpected ejaculation
Jill was pissed Randy was premature last night. Jill said he suffers from Spontaneous Cumbustion.
von PSpin420 1. November 2009
6 2
 
4.
Cumming without being aroused and with no sexual provocation.
As the airplane took off, Bob spontaneously cumbusted.
von tanukisanyo 9. Mai 2005
16 14