Pet gras is French slang for a fat, heavy fart, and Pet Gras 2 circulated as a user-uploaded soundboard clip rather than a clip lifted from a film or show. The '2' suggests a second version in a small set of similar fart sounds shared for pranks and chat jokes. Short fart effects like this spread through meme pages, Discord servers and WhatsApp groups because they are language-free, instantly understood, and easy to trigger live. It remains popular for quick, crude humour where one burst says everything.