Kid Brain 

When an Adult still thinks like a child.

Yeah don't get advice from him, he still has a kid brain.

Kid Brain by Watto86 December 5, 2019

Brainrot Kid

brain·rot kid /ˈbrān-ˌrät kid/
noun slang

1. a young person whose mind or behavior is perceived as dulled or overtaken by excessive exposure to online media such as viral videos, memes, or digital trends.

2. a child or teenager who frequently speaks, acts, or thinks in terms rooted in internet culture to the point of appearing detached from real-world awareness or critical thought.

Etymology: From brainrot (“mental dulling or degradation caused by overexposure to trivial digital media”) + kid (“child or young person”).
First use: Early 2020s.
Synonyms: meme kid; chronically-online teen; internet-addled youth.
Antonyms: bookworm; offline kid; outdoorsy child.

Ever since he started scrolling on YouTube Shorts, he has became a real brainrot kid

Brainrot Kid by Bash_KS_Basho November 12, 2025

brainrotted kid

Jeru

Jeru is a brainrotted kid

brainrotted kid by Jesus is your lord and savior January 3, 2026

Kidbrain 

This is when you act like a kid even if you are not. You may be old yet doing an activity that children do. It may involve doing something that is not intellectually challenging as far as age goes. For example colouring in or playing easy computer games designed for a 5 year old. You may enjoy these activities regardless of age.

Basically it means doing activities set for young children that are fun, but you are too old to do.

"You're a kidbrain." "That is so kidbrain." "We're kidbrain today."

It refers to the task being too easy for the person doing the activity. games

Kidbrain by juliet2010 May 31, 2010

kidbrain 

A derogatory term used exclusively by individuals who have undergone the trials. It is employed to insult or criticize someone by suggesting that they have a kidbrain.

You'll never understand the complexities of this trials, you kidbrain.

kidbrain by Fungus lover June 21, 2024