Tinder is an app. It lets you locate people in your area and be instantly connected to them. Which is totally really just about chatting and... finding out about where to find good coffee in the locality.
Or, you know, casual intimacy.
Anyway, Conan O'Brien has been hearing about this Tinder thing for the last while and was keen to get in on the action. And he brought young Dave Franco along for the ride. Local matches and jokes ensue.