When used as a noun it is the collective term for the code of honor and way of life (just like Bushido). Its origins are from Dagestan and the father of the Smesh is considered to be the ufc fighter Khabib Nurmagamedov.
When used as a verb , smeshing is superior than smashing and always results in changing the face of the smashed guy. This is the highest purpose for anyone following the Smesh code.
Khabib about Conor McGregor:
"His legacy is money. My legacy is Smesh."
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!"