Fart Needles
The pain when you fart and it stings real bad.
(Tom) What's wrong with you? (Bob) I got the fart needles again.
Needle Fart
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.