A term used to describe a moment where a user (or any group of people) watches nothing but Smosh™ Productions videos on youtube, or any videos associated with Smosh as well.
Girl 1: "OMG I'm gonna go throw a Smoshfest at my house! Wanna come?"
Girl 2: Sure! Ian is so cute!"
Guy 1: "Uggh, what's with girls and boys with bowl haircuts?"
Guy 2: "Dont know, but let's throw a Smoshfest at our house!"
Guy 1: "OK! Teleporting Fat Guy!"