Boucheron Syndrome 

A phrase that defines one who's head is too small for their body.

The phrase stems from the character Boucheron from the Nintendo Switch game 'Fire Emblem Engage' who has a strangely small head in proportion to the rest of his body.

That person has a tiny head. They must have BOUCHERON SYNDROME.

Boucheron Syndrome by Spensa-Jade Harris February 4, 2023

Boucher Syndrome 

Little is known about Boucher Syndrome and its sources, but the condition is proven to create constant urges to smile, grin, giggle, or laugh at the most random of times. Other side effects may include some loss of short term memory, increase in appetite for junk foods such as cookies, and/or minor unexplainable "space outs" for time periods of up to 5-10 minutes. The syndrome can be contagious when one's presence around the syndrome is constant or unreasonably close in range.

Zach: "What is she smiling about?"
Ben: "I don't know, but she's been staring into space for quite some time now...wonder what's wrong with her?"
Zach: "I heard she has Boucher Syndrome."
Ben: "That explains it...now don't get too close!"

Boucher Syndrome by Schleigz October 3, 2008