Bad Sit
This is a fart that instead of dispelling out of your ass and traveling safely up your back for everyone to partake, it takes the dreaded turn upward over your cock and balls. Not only do you get the full brunt of the horrific blast, but you can now guarentee you won't be on the receiving end of any Road Head.
Kieth was in the truck and he had a bad sit that made his cock and balls smell like shit.