slot-walking
n.— «One of the guards, Marlene Brown, displayed her casino badge and began to explain the casino’s policy on abandoned tokens. The policy is not posted anywhere, but the gist of it is that such “slot-walking” is forbidden. Patrons may not scoop up even a single overlooked nickel.» —“Just For A Nickel Token” by James J. Kilpatrick Yahoo! News July 19, 2006. (source: Double-Tongued Dictionary)