kin-me gin-me 金目銀目

In Japanese, kin-me gin-me 金目銀眼, "gold eye, silver eye," means a specific type of heterochromia: having one yellow eye and one blue eye.

Character: Amanojaku 天の邪鬼
Anime: Ghost Stories, Gakkou no Kaidan 学校の怪談 (Episode 1)

The reason for such an oddly specific term to exist is that this sort of heterochromia is particularly common in cats and dogs. In anime, cat girls also tend to feature this trait.

Examples

For reference, some examples:

Cats

Molly モリィ, example of cat with heterochromatic eyes, kin-me-gin-me 金目銀目.

Character: Molly モリィ
Anime: Mahoutsukai no Yome 魔法使いの嫁 (Episode 4)

Coconut ココナツ, example of cat girl with heterochromia, kin-me-gin-me 金目銀目, "gold eye, silver eye."

Character: Coconut ココナツ
Anime: Nekopara ネコぱら (Episode 1)

Ibaraki-douji 茨木童子, example of naked apron, hadaka epuron 裸エプロン.

Character: Ibaraki-douji 茨木童子
Anime: Onigiri 鬼斬 (Episode 13, Stitch)

hadaka-apuron
裸アプロン
"Naked apron."

Dogs

Miketsukami Soushi 御狐神双熾, child fox boy form.

Character: Miketsukami Soushi 御狐神双熾
Anime: Inu x Boku SS, 妖狐×僕ＳＳ (OVA, Stitch)

Other

Mikuni 美邦, example of heterochromatic eyes.

Character: Mikuni 美邦
Anime: Shangri-La, シャングリ・ラ (Episode 5)

Oskar von Reuenthal オスカー・フォン・ロイエンタール, example of heterochromatic eyes.

Character: Oskar von Reuenthal オスカー・フォン・ロイエンタール
Anime: Legend of the Galactic Heroes, Ginga Eiyuu Densetsu 銀河英雄伝説 (Episode 53)

Sariel サリエル, example of heterochromatic eyes, jagan 邪眼.

Character: Sariel サリエル
Anime: Nanatsu no Bitoku 七つの美徳 (Episode 7)

Takanashi Rikka 小鳥遊六花, lifting her eye patch to show her "magic eye," magan 魔眼. It's actually a colored colored, because she's chuunibyou 中二病.

Character: Takanashi Rikka 小鳥遊六花
Anime: Chuunibyou demo Koi ga Shitai! 中二病でも恋がしたい！ (Episode 1)