When your body releases a substance, in this case a gas, that is produced by bacteria from your gut or stomach, and is released for relief from sometimes even pain. Other causes involve just letting it go. Some times or most of the times the gas may smell, since its from a pretty nasty place.
"I farted last night at the dinner table"
"It felt good when I farted"
"I couldn't bear the pain until I released my fart"
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