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1.
To be royally screwed out of something important, or something not so important.
1. "Damn, I've been shasted again!"
by Matt Devore November 11, 2005
 
2.
Taking the concept of shitty and wasted to the farthest level and being too intoxitated to stumble.
I was so shasted that I spilled my guts literally in the toilet and figuratively in his face...

I am so shasted right now, please keep me away from the stairs.

I'm going to fornicate fido since Im so shasted!
by CroBear February 01, 2009
 
3.
When one gets shit face wasted
I was so fuckin shasted last night I broke into a fat girls house and looked at her in the shower!
by Davrial Thomas August 29, 2006