Meaning

noun a mood or display of sullen aloofness or withdrawal

verb be in a huff and display one's displeasure

originBack-formation from sulky, of uncertain origin. Probably from Middle English *sulke, *solke (attested in solcenesse (“idleness; laziness”), from Old English āsolcennys (“idleness; slothfulness; sluggishness; laziness”), from āsolcen (“sulky, languid”), from past participle of Old English āseolcan (“be slow; be weak or slothful; languish”), from Proto-Germanic *selkaną (“to fall in drops; dribble;…

Etymology from Wiktionary, CC BY-SA 3.0