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“Fart” is a flammable gas that our bodies produce and eject which is often set on fire by some people “Knock” comes from “engine knock” is when the fuel in an internal combustion engine prematurely combust in the cylinder (damages the engine) “fart knock” is when a person attempts to set their own fart on fire, but end up combusting his/her fart before it goes out of the anus, as a result, his/her anus is blowed up or barbecued from the combusting fart
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