An extremely powerful act of flatulence. The amount of gas expelled is far above, often several times of normal. It makes a very loud, thunderous sound which can be heard even from great distances. They are known to occur mostly in the early morning, but can strike unexpectedly any hour of the day, depending on diet. They are also odorless or at least don't smell as bad as silent and regular ones, considering most of them comes from swallowed air or hydrogen composed by digesting large amounts of high-in-fibre foods. If you are lactose intolerant, eating dairy products may give you a bad case of mega flatulence.
A bad example on how a megafart looks like in real life:

Mother: Oh my, what was that noise? Did someone move the wardrobe?
Daughter (from the other room): No, mom. I just ate some sweet potatoes and your delicious macaroni with cottage cheese, and so I'm a bit gassy now...
by Abasc December 29, 2011
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Someone who farts in the cinema when they’re on a date
Dude Ria just blew up right in the middle of class. She’s a megafarter.
by Pspspsps March 13, 2020
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A facetious measurement of computing power, often used to acknowledge a given device is more powerful while downplaying the importance of such a metric.
The Playstation 6 is rumored to have 69 terashits per megafart.

A used phone will give you everything a new one will, minus a couple terashits per megafart.
by TheRedVixen June 2, 2023
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