Is it possible for a girl to fart?

Yes, girls fart. Whether the passing of intestinal gas is odorless or smelly, silent or loud, in public or in private, everybody farts!

Why do I fart when I come?

Whatever genitals you have, the most common time to fart during sex is at the moment of orgasm. When you climax, your muscles relax, which means that a fart youve been holding in (consciously or otherwise) will be released.