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twit [twit 词源字典]: twit: Twit was originally, and still is, a verb, meaning ‘taunt’ [16]. It is a shortened version of the now defunct atwite. This went back to Old English ætwītan, a compound verb formed from the prefix æt-, denoting ‘opposition’, and wītan ‘reproach’. It is not altogether clear whether the noun twit ‘fool’ is the same word. There is an isolated example of what could be twit ‘fool’ recorded from the early 18th century, but it did not really begin to proliferate as a mild term of abuse until the 1950s.

Semantically, the connection is plausible – a ‘fool’ could be a ‘person who is taunted’ (presumably for being foolish) – but an alternative theory is that it is an alteration of twat [17]. This originally meant ‘cunt’, and is not recorded as a term of abuse until the 1920s. It is not known where it came from. (It was, incidentally, the object of one of the more ludicrous misapprehensions in English literature.

There is a passage in Vanity of Vanities 1660 that reads ‘They talked of his having a cardinal’s hat, they’d send him as soon an old nun’s twat’. Robert Browning took ‘twat’ as meaning some item of nun’s clothing, and so wrote in his Pippa Passes 1841 ‘Sing to the bats’ sleek sisterhoods full complines with gallantry: Then, owls and bats, cowls and twats, monks and nuns, in a cloister’s moods, adjourn to the oakstump pantry!’).
[twit etymology, twit origin, 英语词源]
twat (n.): female pudendum, 1650s, of unknown origin. A general term of abuse since 1920s.
The T-word occupies a special niche in literary history, however, thanks to a horrible mistake by Robert Browning, who included it in 'Pippa Passes' (1841) without knowing its true meaning. 'The owls and bats,/Cowls and twats,/Monks and nuns,/In a cloister's moods.' Poor Robert! He had been misled into thinking the word meant 'hat' by its appearance in 'Vanity of Vanities,' a poem of 1660, containing the treacherous lines: 'They'd talk't of his having a Cardinalls Hat,/They'd send him as soon an Old Nuns Twat.' (There is a lesson here about not using words unless one is very sure of their meaning.) [Hugh Rawson, "Wicked Words," 1989]
affective: "Relating to moods, feelings, and attitudes", Late Middle English: via French from late Latin affectivus, from afficere (see affect²).