also: じとめ
noun
scornful stare; disgusted glare; reproachful eyes
Manga/anime slang for a half-lidded, cold, or disgusted stare, often used when someone is unimpressed or annoyed.
彼女は遅刻した彼にジト目を向けた。
She gave him a scornful stare for being late.
その冗談にはジト目で返すしかなかった。
I could only respond to that joke with a disgusted glare.
白い目 means a cold, disapproving look from others, but ジト目 is more about a personal, disgusted glare, often with droopy eyelids.
Compound of the onomatopoeic element ジト (representing a heavy, damp, or sullen atmosphere) and 目 (eye). The exact origin is uncertain, but it likely emerged in manga and anime culture to depict a character's unimpressed or scornful expression.