shake her ankles

used to describe any sex position where the woman’s ankles shake back and forth from rapid cheek clappage, missionary with legs upwards is an example of one of those positions, it’s essentially like saying legs shaking but less on the nose. variations: crack her ankles, shook her ankles, break her ankles, can also add loose to the end.

“You did WHAT with my sister?!” says Bobert
“Relax man, she just let me shake her ankles loose.” says Mr. Dickinson