leprechaun

noun2

1. •
   A type of diminutive, solitary fairy or sprite, traditionally depicted as a small, bearded man wearing a green coat and hat, often found repairing a single shoe; they typically possess hidden treasure, such as a pot of gold hidden at the end of a rainbow, and can be forced to reveal its location if captured.

   • Do you not catch the tiny clamour, / Busy click of an elfin hammer, / Voice of the leprechaun singing shrill, / As he merrily plies his trade? — 1888
2. •
   (slang, offensive) An Irish person.