ひゃっこいConjugationMeanings1i-adjectivecold; chilly; freezingcolloquialColloquial, dialectal (often Kansai) equivalent of 冷たい. Used for things that feel cold to the touch or for cold weather.See also: 冷たいこの水みず、ひゃっこいなあ。This water is so cold!今日きょうは風かぜがひゃっこい。The wind is chilly today.