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 😒)
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!"
When you accidently say the word "shit" in front of your parents, teachers, etc. you can just cover it up by saying -ake mushrooms!
*George drops his books*
George: "Shit!"
Teacher: "What did you just say young man?"
George: "You didn't let me finish! I was going to say shiitake mushrooms is what I want for dinner!"
Teacher: "Really? Me too."
Or...
*George drops his books*
George: "Shit--ake mushrooms are yummy!"
What a splendid pie,
Pizza-pizza pie,
Every minute, every second,
Buy, buy, buy, buy, buy,
What a splendid pie,
Pizza-pizza pie,
Every minute, every second,
Buy, buy, buy, buy, buy,
pepperoni and green peppers, mushrooms, olives, chives
pepperoni and green peppers, mushrooms, olives, chives
It is an adjective that is used to describe anything or anyone that is insanely beastly, bones everything in their path, and doesn't have the word "lose" in their vocabulary. You must have really boned someone to have been called a Muffgoose.