Definition & Meaning of "squid brain"in English

What is the origin of the term "squid brain" and how is it used?

"Squid brain" is a slang insult used to describe a person considered stupid, slow, or incapable of logical thought. It likely emerged in late 20th- to early 21st-century English, drawing on the idea that a squid's nervous system is decentralized and simple compared with a human brain, creating a metaphor for limited intelligence or poor reasoning. The term is informal and often used online, in gaming communities, or among peers as a humorous or mocking critique. It is derogatory, though usually playful rather than deeply hostile, and is never neutral.