Green’s Dictionary of Slang

1. to become irritated.

1812		Spirit of Irish Wit 102: De Carman miffed and began to be snotty.
1956		‘Ed Lacy’ Men from the Boys (1967) 26: ‘Mr. King was miffed about it.’ ‘He miffs too easy.’.

2. (US) to irritate.

1982		A. Maupin Further Tales of the City (1984) 137: The outburst miffed Mary Ann.
2018		Guardian 2 Jan. CiF 🌐 Far better to let people die needlessly and huff no one than to implement a policy that might miff a few members of the stabbing community.