SK Era (or Spawn Kill Era) is an era of the roblox platform that lasted from mid-2011 to 2019, and basically consists of a time when spawn kill was very common in games that allowed gear on the platform, mostly using gear to bypass the automatic force-field of platform games. This isn't as common nowadays, but it's still possible.
I will sk (Spawn Kill) Abner.
Sk era was annoying, thank god it finally ended.