Bumped your head

You thought wrong

(Very common in the California Prison System, & on the streets)

John can you loan me some money

You bumped your head, no way am I going to loan you any money.

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Fell and bumped your head

Meaning you must be seriously crazy. That you or someone else is experencing a really dumb moment at that time.

After Jimmy made the dumbest comment I ever heard I said fool you done "fell and bumped your head"

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have you bumped your head?

It essentially means you have you lost your mind? or it can be used to express your hatred or dislike for a particular activity or person, similar to kms.

"Moe's is better than Chipotle."
"Have you bumped your head?!?"
or

"This traffic makes me want to bump my head."

or
"Help! I have bumped my head and I can't get up!"

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