A term that is used in reference to how fast a person can run or move. Used in the movie The Longest Yard by comedian Chris Rock in reference to rapper Nelly's fast feet and evasive action on the mock football field. The term predates the movie back to the time of slavery when masters would speak of the toughness of the feet of their slaves due to hardened skin on the bottom of their feet a condition caused by running or moving without shoes at a fast pace.
While watching the Notre Dame game someone shouted "That boy has slave feet!" as the running back ran in for the touchdown.