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1.
Meaning a delirious state of intoxicated happiness. A euphoric version of "smashed". Popularised in the French Alps, and holds great connections with Après-ski (the act of getting "smished" after a hard day's skiing).

Best pronounced using an Australian accent.
Let's smish things up
I was beyond smished last night
I'm smished, and you're beautiful
by Canada-Fougere February 09, 2011
 
2.
To be both pissed and smashed . Can also be used to describe being off your face on illigal narcotics..
'I drank 20 pints last night, I was completly Smished!'
by Evil-Ernie May 20, 2003