1. What does it mean?
플리 shortens 플레이리스트. It means a selected collection of songs, and sometimes a playlist-style video or shared listening set. People ask for a 플리 when they want music for a particular atmosphere.
Also written or said as 플레이리스트, peulli
2. The nuance
It is not a music genre or an endorsement by the artists. A 공부 플리 is a playlist for studying, while an 운동 플리 is one for exercise.
3. Examples
“비 오는 날 들을 플리를 따로 만들었어.”
I made a separate playlist for rainy days.
“친구가 보내 준 플리에서 좋아하는 곡을 찾았어.”
I found a song I liked in the playlist my friend sent.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.