The blood-
pumping organ of a
greedy/selfish moocher/fortune-hunter who only yearns for gold; i.e., his main goal in life is to be given
money to either hoard or spend frivolously.
In the 1937 comedy-film "Way Out West", Laurel and Hardy play a couple of witless buddies who unknowingly deliver a deed for a gold mine to the wrong
woman; the recipient is actually the heiress's devious guardian with a "
heart of gold"... Laurel naively "hits home" by telling her, "Now that you own a mine, I bet you'll be a swell gold-
digger".