a quick and audible fart aka a bird fart. the only noise it makes is 'Ernt'. Sometimes happens whilst sitting on a stool, trying to force a big one out, having to fart so bad that no matter how hard you try to hold it in you accidently let a little one go
Peter: I've been so gassy after Smugglers that I have a huge fart....ERNT!
Girl: Oh Trevor lets have sexual relations
Trevor: uuuh...ok ERNT!
Peter: Here comes a huge fart...ERNT!
Dylan: That was a bird fart!