mad as a cut snake adjective extremely mad AUSTRALIA,1932 Either meaning “out of one’s mind with anger” or “insane”.
Despite all this I still liked him. Probably because he was mad. Really mad. Madder than a cut snake. — Phillip Gwynne, DeadlyUnna?, p. 26, 1998
At this the lawyers were as mad as a cut snake with Jesus, muttering, “We’ve got to do something about this bloke.” — Kel Richards, TheAussieBible, p. 31, 2003