The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with sticky-fingers
A propensity to steal, as in You'd better not leave any cash around; she's known for her sticky fingers. This metaphor makes it seem as if valuables adhere naturally to a thief's fingers.
[ ; late 1800s