1. What does it mean?
In market slang, 물리다 describes buying an asset and then finding its price below what you paid, often with a feeling of being trapped between accepting a loss and continuing to hold.
Also written or said as mullida
2. The nuance
It does not mean selling is literally impossible. Outside investing the verb has other senses, including being bitten or becoming tired of something, so context is essential.
3. Examples
“높은 가격에 샀다가 물렸다는 글을 읽었어.”
I read a post about buying at a high price and getting stuck with a loss.
“물렸다는 표현은 손실 상태의 답답함을 담고 있어.”
The expression conveys the frustration of being stuck in a losing position.
Sources
Sinjoeo Korean Slang Dictionary
References support the meaning and usage. Example sentences are written for NoCapWiki.