Involve oneself in matters without invitation or necessity.
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To get involved in something that is not your business or concern.
When you stick your nose into something, you interfere in a situation you were not invited into.
It is usually used negatively to describe someone who is nosy, intrusive, or overly curious about other people's private affairs.
"Eavesdrop"
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Secretly listening to a private conversation you are not meant to hear
"Overstep"
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Going beyond the limits of your authority or role in a situation
"Stick (poke) Your Nose into Something"
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Intruding into someone else's private business without being asked