Type of walk an already lanky person does that accentuates his/her lankiness. It involves a slight leaning forward, on your toes type of approach. Typically, the lanky individual involuntarily does the lank-walk while in a hurried state of mind (or when he/she thinks nobody is watching), leading one to believe that this is how he/she would always walk if not for purposeful inhibition.
Paul: Why are you walking like that?
Laschelle: (Perplexed) That's how I always walk.
Paul: You've perfected the lank walk.