noun (common) (futsuumeishi) mountain (or hill) behind a house, village, etc.

noun (common) (futsuumeishi) side of a mountain that gets little sunshine

adjectival nouns or quasi-adjectives (keiyodoshi) Internet slang jocular, humorous term envious;jealous;jelly

Urayama

expressions (phrases Internet slang jocular, humorous term being jealous of someone over something but also thinking they should be sentenced to death over it (esp. of male teachers having sexual relations with their students)