오지랖넓다

Being overly nosy or meddling in other people's business without being asked. Not malicious, but annoyingly involved in things that don't concern them. Literally means "having a wide 오지랖 (the front flap of a Korean traditional garment)" — spreading yourself too wide into others' affairs.

오지랖 = front flap of traditional Korean clothing

넓다 = wide