This basically means kissing someone when they're dying, and after the kiss they're dead. Basically being happy one last time before they meet their end.
"Did that anime character really receive an Afterlife kiss?"
"Yeah, it was so sad. I cried all night."
Fans of Avenged Sevenfold who only listen to their hits, such as Afterlife, and refuse to enjoy the "deep cuts". They don't enjoy any music that isn't cookie cutter.
"What's your favorite avenged song? I'm really enjoying the new album!"
"Oh it doesn't really vibe with me, but my favorite song is Afterlife!"
"So you're an Afterlife Andy then?"
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"Man, why is everyone cheering for Afterlife It's not even that good."
"Yeah, what a bunch of Afterlife Andys"