That mate that brings a six pack of boutique beers to the party whereas everyone else brings a case of tinnys, once shared the boutique beers expects endless beers from their friends for the rest of the night.
Named after the folklore telltale of Rumpelstiltskin whose nature is known for shonky deals.
Man everytime I open a tinny Gary asks for one, if he wasn't a rumpelsteal-tins and bought a case we wouldn't have this problem.