Top Definition
Letting rip a properly brewed grunt into the bowl (pan) of a toilet, then setting it alight, causing the grunt to ignite.

This is a dangerous sport, since one has to be virtually seated on the toilet when being lit, to stop a) the gasses from escaping due to diffusion, and b) the movement of getting off the bog blowing the gasses away.

This mostly results in gooch hair removal.
Shit! that pan flash nearly took my fucking gooch hair off!
by Steddaz October 19, 2006
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