brain deficit 

relating to having a brain deficiency. a brain deficit will usually be either very silly, stupid, idiotic or all of the above. shave a square into your son's head to prevent him from getting the brain deficiency. you can also wrap your newborn child's head in a cloth to make their head nice and round, bengali style. this prevents brain shrinkage. unfortunately, there will be some cases in which preventing a brain deficiency will be impossible, as some are just born without brains. these are known as brain deficits. there are no known cures to having a brain deficiency. maybe give your sorrows to the sadh guru or sumin idk

someone: haha Kai, you silly, stupid, idiotic and all of the above, you're such a brain deficit. you're not even a smooth brain because you suffer from an incurable brain deficiency.

Kai: Should I call my mum ??

brain deficit by asalin315 March 12, 2021

Brain Cell Deficiency Syndrome 

When someone acts so stupid, it’s like they have a lack of brain cells in their heads.

People with BCDS typically post nonsense on Twitter and Reddit, and think the moon landing was faked.

Conspiracy theorist: the earth is flat!
Me: the earth is round, dude, you’re suffering from a case of Brain Cell Deficiency Syndrome.

Brain Cell Deficiency Syndrome by GeosWorld April 23, 2023