Top Definition
A rancher in the old west wanted to only purchase a mule that had a large muscular hind quarter. Twenty dollars was a lot of money so a rancher would only pay that much for a mule that was well built. Used to describe a woman with a nice round ass made for "working".
Wow that girl has an ass like a $20 mule!
by 4cd-air September 16, 2013

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