A fart that sneaks out the front. This phenomenon usually occurs while seated. The fart gets trapped in the butt cheeks and slowly makes it way out the front instead of the back. A slight tickling sensation may be felt as the air bubble makes it's journey from anusville through grundle town.
Steve: Damn Gina, Did you just queef? It smells a used diaper filled with Indian food!
Gina: No, that was a butt queef! I tried to sneak a fart out and it came out the front. I guess that curry slurpee was a bad idea!