stick your oar in

The phrase "stick your oar in" means to interfere or offer unsolicited advice or opinion in a situation or conversation without being asked or invited to participate. It is often used to convey annoyance or frustration with someone who is meddling or being overly nosy. The phrase originates from the action of inserting an oar into the water to steer or propel a boat, implying that the person is unnecessarily involving themselves in someone else's affairs.