Green’s Dictionary of Slang

1. a tantrum, a petty quarrel, a tiff; thus miffed adj.; miffiness, the propensity to take offence at the slightest justification.

1623		C. Butler Feminine Monarchy sig. v, L4v: This is not to be done [...] lest some of the Bees take a miffe, and goe home againe [OED].
1721		Cibber Refusal 35: She’s in a high Miff.
1749		Fielding Tom Jones (1959) 69: She would throw it in the teeth of Allworthy himself, when a little quarrel, or miff, as it is vulgarly called, arose between them.
1768		O. Goldsmith Good Natur’d Man Act IV: I knew one Bett Stubbs, of our town, that was married in red; and, as sure as eggs is eggs, the bridegroom and she had a miff before morning.
1816		W. Scott Antiquary in Waverley (1855) II 35: In accomplishing an arrangement between tendencies so opposite, little miffs would occasionally take place.
1843		R. Carlton New Purchase I 183: Mrs. Ashford soon got over her miff.
1926		Wood & Goddard Dict. Amer. Sl.
1978		L. Kramer Faggots 211: He had picked up the special order he’d placed in a moment of miff.

2. (US) a general term of abuse.

1839		Crim.-Con. Gaz. 21 Dec. 311/1: George never did keep any company but milk-and-water scamps and worn-out miffs.
1907		‘Hugh McHugh’ Beat It 63: That miff is over here to pick out an heiress and fall in love with her because he needs the money.