What word or phrase does your mother always say?
late 14c., "a dealer in skins," from skin (n.); as "one who skins," 1690s, agent noun from skin (v.). The surname is attested from mid-13c. Also in U.S. use "one who strips, robs, or plunders;" the name given to a band of marauders who committed depredations on Loyalists in New York during the Revolution. Cf. Old Norse skinnari "a dealer in skins; a skinner, tanner."
Skinner Skin·ner (skĭn'ər), B(urrhus) F(rederick). 1904-1990.
American psychologist. A leading behaviorist, Skinner influenced the fields of psychology and education with his theories of stimulus-response behavior.