Green’s Dictionary of Slang

(US campus) an incapacitated, immobile person, usu. from drink or drugs.

1981		Eble Campus Sl. Fall 5: mutile – an incapacitated, immobile person [...] He was well into a fifth of Bacardi and couldn’t move from the couch. He was a complete mutile.
1996		Eble Sl. and Sociability 78: Mutile is phony French for ‘an incapacitated, immobile person’; and the French pronunciation of the suffix -ment in solidment makes the affirmative response solid more emphatic.