1. What does it mean?
코노 shortens 코인 노래방. It refers to a karaoke venue where people can sing a small number of songs in a booth or room, often without booking a long group session.
Also written or said as kono
2. The nuance
Modern venues may accept cards or sell time-based sessions too. The abbreviation names the type of venue, not a fixed price or a requirement to insert physical coins.
3. Examples
“약속 전에 시간이 남아서 코노에 들렀어.”
I had time before meeting someone, so I stopped by coin karaoke.
“코노에서 오랜만에 옛날 노래를 불렀어.”
I sang some old songs at coin karaoke for the first time in ages.
Sources
Sinjoeo Korean Slang Dictionary
References support the meaning and usage. Example sentences are written for NoCapWiki.