A skinflint is a person consiered so miserly that he would even "skin a flint" to save something of it. A flint is a small piece of flintstone used to strike a spark in the tinderbox. The flints in modern day lighters aren't made of flintstone, but rather of Ferrocerium. A 'skinflint' dislikes spending money and is also sometimes referred to as a 'tightwad', a 'miser', a 'niggard', a 'piker', and a 'penny pincher'.