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A phenomenon in which all dads wear there same acid wash jeans from the 80's-early 00's. No mothers wear the mom jean anymore, they only wear sweatpants, hence the dad jean. All jeans must all be must be atleast 5 years old.
Person 1 (Talking to her husband/boyfriend): Honey, you have to get some new jeans, they're looking pretty worn!

Person 2: No they're not, they look perfectly fine!

Person 1: No, they look to old now, they've turned into the dad jeans.
by ThroughtheLookingGlasses May 02, 2011
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