When a male (or female) uses the thumb of his (or her) hand to gracefully cork or seal an opening of the human body (natural or otherwise). It is not limited to any specific orifice. The act of doing so is either a sex position or emergency medical procedure depending on the situation.
"My .50 Cal just exploded, and now i'm injured! Quick, someone give me the Kentucky Plug!"
or
"Last night went well. She wanted a reach-around, but instead i gave her the good ol' Kentucky Plug!"
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