invertebrated, adj. — Green’s Dictionary of Slang

invertebrated adj.

[SE invertebrate, without a backbone, i.e. one has collapsed]

(US campus) drunk.

1982		Eble Campus Sl. Fall 3: invertebrated – so drunk that you’re unable to stand.
1996		Eble Sl. and Sociability 45: Among the synonyms for drunk are [...], invertebrated, juiced, laid out.