Plural of dort; moods of sullenness or bad temper, or moments of being out of sorts; can also refer to small pieces or fragments.
Likely from Scottish/Northern English dialect 'dort' (to sulk or be bad-tempered). The word may also have connections to Old English or Norse roots meaning to be stubborn. The plural '-s' is the standard English pluralization.
In Scottish dialect, 'having the dorts' is like English 'having the huff'—it's a poetic way to describe that petulant mood where everything annoys you and you want everyone to know it.
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