What is Dickner?
1.
Someone who slyly takes something from you without your permission, uses it, then just leaves it somewhere else, instead of fully stealing it and taking it home. You may or may not find your misplaced item at a later time, lying around somewhere.
Dude, some dickner took my wrench set from my toolbox, then instead of putting it back, he just left it in the driveway.
See