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."
Dana White: Hey Khabib how are you?
Khabib: Hey I'm gonna smesh your boy.
A really smart guy you would want to hang out with every day. He's really friendly, stunning, hot and cute. He's an amazing person. If you had to pick someone to go out with him, you should choose him cause he's the right type of guy for any girl. His love is unbearable
Friend: OMG, did you see who jessica went out with last night???
Me: Who?
Friend: I can't believe you don't know, it's that cute guy, Somesh!!