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horn mad adjective completely mad, crazy: O ho! Mither wis horn-mad wi me later oan ... [Mother was very angry with me later on.] 20-. Compare stone horn mad etymology: possibly a development from Scots reid horn mad with the same meaning; attested by ET note:

Grose and Egan (1823) and define it thus: A person extremely jealous of his wife is said to be horn mad; also, a cuckold who does not cut or breed his horns easily. No, I’m not sure what the second part means either.