What part of this don't you understand? or Don't you get it?
Jen:Get the fuck away from me.
Brad: *just stands there*
Jen: um....go away dick, what part?
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Used to emphasize that one is failing to accede one's demand (connotation that they cannot understand what was said).
"I joined his clan. Don't ask."
'DON'T ASK'
"Hey, what-" \/
"WHAT PART OF DID YOU NOT UNDERSTAND?!?"