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

Fart Knuckle 

It's reference is to someone who is dumb as a bag of hammers and/or is dense. It's when your knuckle smells like your ass because your finger is shoved up there.

This douche fluid we are working with is a fart knuckle

Fart Knuckle by wolfhound61 October 3, 2017

fart knuckle 

the fart resulting from intense fist knuckle action. The fart's intensity and smell is equal to the depth and size of the knuckles.

a. wow his hands were so big, i got some gnarly fart knuckles.

b.guy: dude did you just fart knuckle?

other guy: yes, yes i did.

guy:smells like he knew what he was doing.

fart knuckle by JuniorBaconCheeseBelly July 13, 2010

Fart knuckle 

A person who has to fart but your in public and your scared to let it out and for people to smell it and if you ease it out it could be wet and you could shart yourself.

Your such a fart knuckle dude!

Fart knuckle by Mossy_lemom June 19, 2025

fart knuckle 

When you catch a whiff of your unwashed hands and they smell like ass.

Can you give me some hand sanitizer, friendo? I've got a bad case of fart knuckle.

fart knuckle by BuckBuck McGee June 20, 2025

fartknuckle 

when someone farts and it sounds like they cracked their knuckle

Jane tried to get away with a quiet fartknuckle, but we all smelled it and blew up her spot.

fartknuckle by wordslanggga December 30, 2014

Fartknuckle 

This is what you call someone when they are being a little shit.

Bob pushes your 110 year old grandma down the stairs.
Mother: you fartknuckle!

Fartknuckle by Volleyball24 December 21, 2019