This is the LikeBelt: a concept device that inserts an NFC chip into a belt-buckle. Instead of tapping your mobile device on a "check-in" tag, you get the belt buckle close enough to do the same. There are only two downsides: how close you have to get and where most people's belts are situated. Suffice to say, the Quagmire-style movements required to ensure a connection aren't the sort of thing you'd do in front of your parents, priest or spouse. The creators provide instructions on how to build your own at the source link, but before you consider it, we insist you watch the vide
