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!"
A smasherteer is someone who has all the qualities needed to smash it in, such as the ability to talk absolute shite all night long, to drink anything that is put in front of them, being absolutely ruthless with the opposite sex and convincing them everything you say is true.
Fuck, you drank 4 hot Dostavs, 6 Avi's lovers and 9 Smash it ins last night, awesome smasherteering!