An "all-kill" describes a song that reaches the top of every major Korean real-time music chart at the same time.
What an all-kill means
South Korea has several music charts. When a song sits at No. 1 across all of the major charts at once, fans call it an all-kill. It is a measure of broad, simultaneous popularity rather than a single official award.
All-kill vs perfect all-kill
A "perfect all-kill" (PAK) is the stricter version: the song tops both the real-time and the daily charts on every major service at the same moment. A perfect all-kill is harder to achieve than a regular all-kill.
❓ FAQ
Is an all-kill an official award?
No. It is a chart achievement based on simultaneous No. 1 positions, not a ceremony award.