Q: What does DNFTT mean?
A: Do not feed the troll.
Q: What is a troll?
A: “Troll,” in the context of message boards and the like, describes somebody who is posting just to be confrontational or to raise hackles.
See Staff Report: What is a troll? (14-Apr-2000)
Q: What should I do when I see a user “trolling” at the SDMB?
A: Do not publicly accuse someone of trolling at the SDMB. Use the “Report this post to a moderator” facility below the “trolling” post. Do not reply to the troll in any way in the thread, that will only encourage the troublemaker.
Q: What if I’m not sure if the person is a troll?
A: Treat the person as a user in good standing. Respond to the post if you have something useful to add, otherwise say nothing.