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1.
Sexually excited by explosions or fire
All those fireworks gave me a pyrogasm

Last night I got a huge pyrogasm from all those fires i started.
by PyroManiac699 July 04, 2010
 
2.
The sensation of setting ones pubic hairs on fire
when Timmy was left home alone with a lighter and nothing better to do, he tried out a pyrogasm which he soon found to be very unpleasurable and quite painful.
by Zim Roxo October 25, 2009