Augmentative leg in several of its meanings.
Heavy thighs. Thunder thighs.
"Tiene unas piernotas y unas nalgas de campeonato."
It is a very large leg. Augmentative of leg. In Colombia we say piernota to denote also a big buttock, a large tail, a large ball and a big hip. It can also be a thigh of Turkey or ostrich ( 41 large thigh;.
Piernota is the augmentative of leg; given that are two legs of a woman, for example, is better in plural ( 41 piernotas;.