Combined from both "shit faced" and "wasted" into one word for enjoyment.
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When you snort a substance and you smell it but taste it at the same time.
Yo did you schmaste that coke. It was fire.
it is where you and your friends get so wasted together,
you know that you are so wasted, you try to go and say that you're 'wasted' but it comes out as 'schmasted'
gabby- yeah girl, you don't look so hot.
alana- I'M SCHMASTED!!8&@$%