Definitions by free42night

Fart Knuckle 

noun: refering to the knuckle on your finger that, when inserted into the rectum of your sexual partner will cause them to expel gas around your finger and out their ass

dude check this out!!!! Got it in Sherry all the way up to here before I hit the fart knuckle!!!

Fart Knuckle by free42night August 24, 2006