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.