For the self-deprecation, please see old fart.
Farting or passing wind was the act of expelling fecal gas from one's intestines.
In 2381, Brad Boimler suffered severe gas pains, causing him to wake up. He expressed his desire to be able to fart on footage recorded of the USS Cerritos crew. (LD: "Grounded")
According to Ma'ah, Malor could barely pass wind, let alone a trial. The other Klingon retorted that he could. (LD: "A Farewell To Farms")