[mayankkaizen]

I was also ignorant about this so I googled. It said it means "Thanks for Asking" or "The fucking article". The second meaning sounded correct but I found it weird.

"The fine article" also sounds weird to me.

[bmacho]

The featured article.

For usages see https://hn.algolia.com/?query=TFA&sort=byDate&type=comment

[amadeuspagel]

Is this acronym really worth it? I always just speak of the article.

[rolenthedeep]

HN has a whole series of acronyms for things ranging from "the linked article" to "the nth comment above this" and its super confusing.

I've given up on trying to learn them and just take a stab based on context

[medstrom]

Hacker legacy. It comes from "RTFM" (Read The Fucking Manual), said to people on mailing lists who ask questions easily answered by the manual.