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When someone is feeling sentimental about their crush.
Wow she blushed when I showed her a picture of him. She must be mushin
Mushin by Intrepid Siblings December 17, 2019

Mushroom 

Typically a British slang term for the glans, or 'head'of the penis. Due to it's general appearance and size/shape.

See also bellend, tip, cockhead, dickhead, little head, purple head etc.
Oi lads! Look at my foreskin hanging over the top of my mushroom!
Mushroom by Llewelyn Dowd August 28, 2022
Most admirable and exquisite girl you’ll ever meet.Trust me when I say...she’s worth living for.Her smile is BEAUTIFUL and she would make the perfect girlfriend!
Person1:Who are you in lov3 with?
Person2:I’m in love with Musfira
Musfira by TheFreshTeddy December 23, 2019

Mushroom Syndrome 

(n) - A syndrome where you're fed bullshit and kept in the dark. Derives from the method of cultivating mushrooms: they add a lot of fertiliser and keep them in the dark and damp.

A person can suffer from Mushroom Syndrome in any way; the only circumstances are:

(1) A person doesn't tell you everything about a certain situation concerning you/and or them

and;

(2) They tell lies.
Sarah: So how's your relationship with Andy going?

Bree: OMG! He gave me Mushroom Syndrome! It turns out he was actually gay, which he never told me about.

Sarah: Wow! So what did he bullshit to you about? You know, the other half of the Mushroom Syndrome?

Bree: Oh, he told me he didn't break the blender but it *actually* was him!

Growing mushrooms 

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!"
Growing mushrooms by zoy70 June 3, 2018

Mushroom dick 

A smaller then average penis (but not freakishly small) with a large mushroom or toadstool shaped head.
Donald J Trump has a mushroom dick!
Mushroom dick by Dagwood55 September 18, 2018