What does this phrase mean?
Wer hat Ihnen denn ins Hirn geschissen?
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Sign up to join this communityIt could be roughly translated to English as
Who has planted that bullshit into your brain?
or
Who took a crap on your brain?
You should notice that this is very rude, and not appropriate for serious and professional conversation.
If someone attends to you in that way in a professional context, you should probably escalate that to a higher management level for inappropriate behavior, unless it was a response to a really silly, unconscious or absolutely unacceptable statement made from your side.