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One who tends to interrupt or meddle in others' lives. The term is a play on the phrase "butt in," meaning to intrude or encroach. A: "Mom is constantly trying to fix me up with other people." B: "Ugh, I know, she can be a real buttinsky." Geez, Aunt Connie is such a buttinsky, constantly lecturing me as though she knows what it's like to be a college student today. Can you give us five minutes to talk and stop being such a buttinsky?
buttinskyand buttinski (bəˈtɪnski)
n. someone who interrupts; someone who gets involved in other people’s business. I hate to be a buttinski, but what are you talking about?