When a pair of jeans are worn by a girl they create the perfect apple shaped ass, but when they are removed the ass no longer retains the shape and sags or becomes flabby looking.
man that girl has a nice ass....No that girl has jean ass, or she has a case of the jean ass
by Jeremy Diver August 10, 2007
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A type of girl denim jeans or pants that are especially favorable for showing the perfect curves of a girl's buttocks, usually pocketless. They can only be worn by some.
"Dude, did you see that chick's ass?"
"Yeah, girls should wear ass jeans more often."
by Battalion_Stallion February 1, 2008
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That one pair of jeans that makes you look in the mirror and say, "I'd tap that." Also known as the pair of jeans your butt looks best in.
"I went out today and bought a pair of Sevens... I think they might be my new ass jeans."
by agentthirteen April 14, 2009
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Jeans/denim that are no longer trendy at the moment, but they were in a previous cycle.

Similar to comparing the big city trends to the suburban trends, and how the suburbs are often one-step behind the more modern city trends (Portland, Oregon versus Salem, Oregon in this example).

Portland (circa 2014): Everyone wearing dark washed, selvedge denim.
Salem (circa 2014): Everyone wearing light washed, bootcut jeans with hammer loops.
When my friend Kevin moved to Portland from Salem, he lamented his current jeans situation: "I need to get some newer jeans for Portland, I got some Salem Ass Jeans right now."
by manjoseph January 21, 2022
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