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ass fault 

a violation of etiquette that occurs when the posterior of the person seated next to you (typically on an airplane flight) crosses over into your assigned seat, impinging upon your territory, privacy, and comfort.
"The obese man got the last seat on the plane next to me, and he committed an ass fault when his butt spilled over into my seat."
ass fault by FactCheckGirl April 7, 2010

Ass Fault 

1. like a foot fault in bowling this kind of fault is because of your ass and this isn't crossing the line of where you cant step this is crossing the line of how the air should smell
Ass Fault by Kleets McCool July 30, 2011

Faltering ass boundaries 

When a females "no"'s mean "yesssss" then turn into real " NO" or even a "stop it I'm serious"
Damn girl you confuse the f*** out of me with your faltering ass boundaries

assfault junkies 

An obnoxious motorcycle gang based in Cincinnati composed primarily of tools, squids and douche bags.
Hey did you see the news? A bunch of Assfault Junkies got arrested for doing wheelies down the highway....again

Did you see that guy almost crash his bike? What a total assfault junkie!
assfault junkies by Eric M 775 October 24, 2010
n. AssFault is a more elegant and more sophisticated term to replace the relatively more vulgar ButtCrack or its synonym, AssCrack.

etymology: AssFault is a conjoining of two terms: "Ass," which refers to the posterior of a person, and "Fault" which is a geological term indicating a break or a crack.
After the long bike ride over the asphalt my AssFault was very sore... I think I need a new seat.

Dude 1: Dude-- pull up your pants. I can see your butt is broken!

Dude2: What?

Dude1: I can see your AssFault!
AssFault by Neologian-PJG November 16, 2012
A disgusting feature that makes a relatively nice ass look bad. (hair, mole, boil, hemmeroid, etc.).
Cellulite is a major assfault. It can make the nicest asses go bad.
assfault by bLiTch June 19, 2008