RichThesaurus
crazy as a pet coon
vs
non compos mentis
crazy as a pet coon
adj
Demented or crazy.
non compos mentis
adj
Insane; not of sound mind; not in control of oneself.
How often have the words
crazy as a pet coon
and
non compos mentis
occurred in a corpus of books?
(source:
Google Ngram Viewer
)