Bendy knee
n (ben dee nee)
The ungainly gait adopted when a person wears heels that are too high for them. The person is unable to straighten their front leg as they put their weight onto it because the ball of the foot makes contact with the ground before the heel does. This results in the person looking as though they're walking through a freshly ploughed field.
Shirley: Check out the bendy knee on her.

Sloane: Sweet Jesus Shirley, that slut might have $500 shoes but she sure as shit can't walk in them.