Top Definition
Acronym for "Raw Dog, Nut Inside." Refers to initiating in sexual intercourse without a condom ("raw dog") and proceeding to ejaculate inside the woman's vaginal cavity ("nut inside").
Rich: "Last night, I hooked up with a random."
Dibo: "Did you RDNI?"
Rich: "Obvi"
Dibo: "You now have a child and HIV"
Rich: "Yes."
by Bradley J. September 18, 2005

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