He is a fast/slow 'walker'. [=he walks at a fast/slow pace]
She joined a group of 'walkers' in the neighborhood.
(..) Spider, what is your rush? Thank you. Spider, that bandage on your foot is bigger than your fucking head. Next thing you know he will have one of these fucking walkers. But you can still dance. Give us a couple of fucking steps, Spider. You fucking bullshitter. Tell the truth. (..)1990 Goodfellas