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!
A Cincinnatibased group known worldwide for their excellent bird watching skills. Colors are black and yellow with a nuclear symbol. Often seen commuting to various bird watching locations on their sport bikes
The Assfault Junkies recently opened up their own shop! They have the best bird watching equipment in town!