When you force a fart out so hard that it causes a sharp pain in your asshole, as if the fart were made of thumb-tacks.
I tried to push out a fart really quickly to impress my friends. It turned out to be a needle fart, and I thought my ass was bleeding.
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The pain when you fart and it stings real bad.
(Tom) What's wrong with you? (Bob) I got the fart needles again.
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An old person between the age of 50 and 75 who doesn't realize what impact their grumpy mood has on the people around them.
For example the scene from A Million Ways to Die in The West, featuring the main characters father sitting in a rocking chair. The father is a Needle Shits Old Fart!