jackabaun noun in Newfoundland, a mischievous person not to be trusted CANADA This word may have descended from the British “jacobin” (a political reformer).
A saucy, deceitful person. My aunt caught a young man picking her berries. Next time she saw him she called him an ugly jackabaun. — oralinformantinDictionaryofNewfoundlandEnglish, p. 271, 1982