A "killer headline" refers to a catchy and attention-grabbing title or heading for an article, advertisement, or news story that captures the reader's interest and compels them to read further. Full definition
You'll get recommendations and links to tutorials on SEO copywriting and writing killer headlines. (nextscientist.com)
Also, grab a list of killer headlines (they're out there) or keeping a running list of writing prompts and topic ideas is a sure way to fight blogger's block and keep that content flowing. (remonline.com)
If you've done all the work to craft a great piece of content, top it off with a killer headline and then publish it on LinkedIn, don't forget to give prospects an easy way to take the net step and engage you further! (inc.com)