Be brain-dead adjective
"Be brain-dead" means that a person no longer has any brain functions.
The girl was brain-dead because she had a nasty fall from the second floor onto the ground,
When one is mentally tired or unable to concentrate, one can perform poorly or make easily avoidable mistakes.
A: Five minus two equals one B: What! You are brain-dead. You need a break right now.
I've finished studying online lasting 6 hours, I'm brain-dead.
Said when you are too tired to do something
Completely fatigued.
Used when one suffers from mental or emotional exhaustion
Very tired as you've used too much cannabis.
The verb "be" must be conjugated according to its tense.
The origin of this slang is based on its figurative use of the adjective "brain-dead".
A humorous way of saying that what one has said is just what they acknowledge and may not be entirely accurate
Mike: Have you returned from your vacation on the beach? Your skin seems to get tanned.
Jenny: My skin is always dark. That's my story and I'm sticking to it!