Used mostly in anime and manga, the term growing mushrooms refers to when a character has become immensely
depressed or saddened. The character is often shown to literally grow mushrooms on their body, signifying that their soul is, for the time being, in a dark and
dank place. (Mostly occurs with more dramatic and over the
top characters who can't stop crying every 2 seconds ๐)
Senpai: (crying because the girl of his dreams thinks he's dramatic and egocentric)
Girl: "
Senpai, quit growing mushrooms around me; the smell is absolutely
noxious!"