fork in the brain

the same as having your foot in your mouth, but makes more sense when you are having a typed/written conversation.

When your brain goes haywire during conversation.

I can't believe I just said that. I guess I have a fork in the brain.

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Fork Brain

When you have been awake for around 20+ hours and cannot think straight, or form a straight sentence, similar to being drunk

"I need to go to sleep, I've got some serious fork brain