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Btw, I have lots of friends saing ''What you said?'', or, better said ''Whacha said?''...
Are you trying to encourage learners to use such a sentence, Ben?
The only people I've ever heard saying "What you said?" were some of my students in beginner ESL classes. This is a typical beginner mistake. By the end of the course, they were generally able to correctly say "What did you say?"
what u said vs what did u say 
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