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.