1. What does it mean?
피켓팅 blends 피, blood, with 티켓팅. It exaggerates how difficult it feels to secure tickets when many people compete for limited seats. Concerts are a common context, but other sought-after events can inspire the same label.
Also written or said as piketting
2. The nuance
The blood imagery is figurative. It does not imply physical violence or tell you the actual odds of getting a seat.
3. Examples
“좌석이 적어서 이번 공연도 피켓팅이겠어.”
With so few seats, getting tickets for this show will be a scramble.
“피켓팅 끝에 겨우 한 자리를 잡았어.”
After the ticketing frenzy, I barely managed to get one seat.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.