1- A vuft is a flirty fart because we all know that girls don't actually fart, but there has to be an escape from all that hot air they hold inside. Some can turn out to be minty in smell, and the reason for that is still being investigated.
2- A fart, burp or any other escape of gas from a female during a date setting or in front of a guy she likes. Can also be a quief
Man: WOAH! Tell me you did NOT just vuft.
Woman: I'm sorry. At least it smells minty. It's not a smell that could kill you.