Green’s Dictionary of Slang

schwasted adj.

also shwasted
[shitfaced adj. (2) + wasted adj. (8)]

extremely drunk.

Urban Dict. 🌐.
[US]C. Eble UNC-CH Campus Sl. 2011.
[US]C. Eble UNC-CH Campus Sl. Spring 2014 13: SHWASTED — drunk.