What is... OH! Right. Elliot met aliens today. Yeah, probably not best to chat about that in public.

That "swish" is in reference to the ancient art of throwing a basically into a hoop with a net attaches to it. I believe the game is referred to as "nethoop ball", with "nethoop" pronounced "neth-oop". Scholars and everyone else I talk to disagree, but they keep talking about baskets, and those have nothing to do with anything so they're clearly mistaken.