A form of flatulence resulting from the consumption of a large quantity of fast food hamburgers and ketchup. Typically, a ketchup fart will have an odor similar to the fast food hamburger and ketchup before their consumption; those that smell a ketchup fart are often disturbed by this fact.
Jared celebrated his birthday by pounding a super size double quarter pounder with cheese value meal with extra ketchup. Later that night, while impersonating the semen demon for Jessica, Jared let out a ketchup fart, ruining the moment.
by JiggaroniSalad September 20, 2012

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