Let me see...
"TRUTH" - the moment I read this word, I know further discussion is pointless. (Not that I often go off debating fundies.) The word harbors no argument; you cannot argue with facts, truths, etc. The problem is when you assign that word to subjective things like religious faith, which by definition cannot be facts or truth, because the word faith implies that you are accepting something as true without requiring evidence. Believe it or not, I don't have a problem with that - I'm perfectly willing to respect others' beliefs, but when you tell me that what I believe, based on evidence and the scientific method, are automatically invalidated by your "TRUTH", my opinion of you drops considerably.
"CAPS" - Hell, while I'm at it, any time anybody feels the needs to do the internet equivalent of yelling in my face by abusing the crap out of the Caps Lock button.
"Born Sinner" - Fundies love that phrase because it means the default behavior is immorality, and only through indoctrination can the newborn be "saved". I prefer to think of it as "children will test the boundaries of the world around them, and it's up to you to make sure they have the right outlook on life". If that sounds awful damn close to fundie indoctrination, that's because it is in its concept - I just think fundies screw it up by teaching their children intolerance, hate, etc.
"Christ" - If used in place of "Jesus" talking about Christian doctrine. Look, if you talk about the "teachings of Jesus", we know damn well what you're talking about. Labeling it the "teachings of Christ", while technically the same thing, have a much more confrontational vibe to me.
While I'm on the subject...
"Keep Christ in Christmas" - Nobody wants to take away your Jesus Worship, fucknut. Saying "Happy Holidays" because - *choke, gasp* - there are other holidays than Christmas around the same time and nobody has time to say "Happy Chanukah, Merry Christmas and Happy New Year" is not an attack on your religion. Nor is the abbreviation "Xmas". Nor is calling the time American students get off school around the same time "Winter Break". If you really want to talk about cheapening the message of your pagan-turned-Christian holiday, look at every goddamned department store in the country. Of course, complaining about that would reduce your odds of getting a new console, and so nobody says anything.
"The X agenda" - I'm putting this here because, fuck it, nobody has any legitimate non-religious reason to ban gay marriage/sex changes/etc. You could argue I have a chip on my shoulder for this one, being gay myself... but that doesn't make it any less justified. It's not enough that a bunch of people want to be treated better legally, and by society; no, there has to be some sinister fucking plot behind it. Not just any run-of-the-mill conspiracy either; everything and everyone that does not conform to the heteronormative standard imposed by society today must seek to tear down the entire country, the concept of morality, and the human race.
I think I've covered most of the phrases that piss me off, though that's not even half of fundie behavior that gets under my skin.