1. What does it mean?
오지랖 literally refers to the front part of an outer garment. In 오지랖이 넓다, the image becomes extending yourself into matters that are not yours, often through unsolicited advice or interference.
Also written or said as ojirap
2. The nuance
It can be light self-mockery or a complaint about crossed boundaries. Good intentions do not guarantee the other person wants the advice; ask before stepping in.
3. Examples
“내가 부탁하지 않은 진로까지 정해 주는 건 오지랖 같아.”
Deciding my career path when I didn't ask feels intrusive.
“오지랖일까 봐 먼저 도움이 필요한지 물었어.”
I didn't want to meddle, so I asked first whether help was wanted.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.