The loose sounding expulsion of air from the vaginal canal. Surprisingly guys can borf as well. When you have a "BIG FART" those things can just barrel out of there. The same applies for a girl, except out her va-j-j.
"As i walked home from Silver Lake restaurant, i felt as if something didnt apply right with my stomach-BORF!" also theres the after sex borf. "that was amaz-BORF!" "uhh...fucking gross." said brendan