Top Definition
Expulsion of a large, loud and foul smelling bolus of gas explosively from the anus. Most often, but not always, accompanied by some liquid substance. Has similarities to projectile vomitting in that there is a large volume expelled in a very short time.
The poor child was writhing in agony, and was saved by the inevitable thunderfart.
by Doug Pearson June 29, 2006
A Thunderfart is a fart that, when farted it sounds like thunder.
"Is there is storm coming?"
"No. Why?"
"I thought I heard thunder."
"Oh... That was me. I farted a Thunderfart."
by Azeroth98 July 04, 2013
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