When a girl has more fat in her legs than in her midsection, so she looks do-able from the waist up, and chunky from the waist down.
Scene: Girl slowly walks out of pool on the stairs
Alex: "Whoa man, check out that chick!"
James:"She looks pretty fine."
Alex:"Yea she does! She is the hottes... holy shit!"
James:"DAMN SHE GOT THEM CHUNKY LEGS!"
(girl in pool is a victim of chunky leg syndrome)