Definition

High-waisted, overly tight pants that make everyone look like they're about to attend a 1987 PTA meeting or teach hot yoga to suburban soccer moms. Maximum 'I gave up on fashion' energy.

Example Usage

She showed up in those mom pants and I couldn't stop laughing—she looked like she was about to chaperone a field trip.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=mom%20pants&defid=2114423)