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A response to a bold statement, accusation, or action; slang for "you're going to wish you hadn't said/done that," or "bitch you'll pay for that."
"Yo momma's so fat, I poked her in the belly and gravy came out."

"Oh no you DI'INT!"
by Seth Livingston June 29, 2005
um...oh no you didnt
"i just saw jack"
"oh no you di'int"
by merja October 04, 2003