When you're so fucking drunk, that "drunk" is no longer sufficient in describing your state of belligerence. People who are "ShitPiss Wasted" can often be found on the floor in a small lake of their own vomit and/or faecal matter and/or urine (hence "ShitPiss" Wasted), or unconsciously dancing with fucking hoodrat dirt squirrels while darting their bumholes.
Yeah, he's ShitPiss Wasted