Excerebrose seems like a nonce word for "out of your mind."
It is perhaps better than "decerebrate" which means


de·cer·e·brate
adj 1 : having the cerebrum removed or made inactive < rats> 2 : characteristic of decerebration < rigidity> .

Decerebration is irreversible. An "excerebrose" person presumapbly can recover. People who think they can beat
a slot machine are "excerebrose". They may be quite normal
otherwise.

also: anencephalic
ANENCEPHALIC
Pronunciation: an`ensuf'alik


Matching Terms: anencephalia


WordNet Dictionary

Definition: [adj] characterized by partial or total absence of a brain