Board Thread:The Flash discussions/@comment-9346948-20161123011226/@comment-16581186-20161126165253

Probably, but killer can be a subjective term too, like cool (no pun intended). Like, "that's a killer swing" or "that's a killer pair of new Jordan's" or "a killer hairstyle". I can buy "Wow, you put a Killer Frost on that dude", without it literally meaning that she killed someone.