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1.
Someone who schemes. One who has a shifty, guilty, and/or mischievous air about them. A sneaky dickens is a crafty trickster. Whether they get away with their stealing/pranking/schemes or not, they are deemed a sneaky dickens for life.
Sarah: Look, Chantal stole Carly's french fries when she wasn't looking!

Jee-eun: That sneaky dickens!
by the tightness February 23, 2013