Unless I missed it, I'm going to toss in my suggestion.
I call it a gurgle or a flutter..depends on who's doing it, how he's doing it and what it sounds like at the the time...but they're both the same to me.
There's a couple of ways to do this. One is playing a note or a series of notes and 'beating' on the body of the guitar near your trem. This causes it to 'flutter' and you get that sound. I don't care for this one as the actuall pounding on the guitar tends to echo through the pickups and the amp and eventually your head. The other way is to hit a note (pluck a harmonic on the 5th fret, b string (high b if you're on a Universe) and then start to pull up on the trem..when you pull it up, let it go quickly.
The hard part is to get this effect to happen when several notes are being played in succession. Takes practice, but if it's the effect you are looking for, you'll know if it's right.
I got inspired to learn how to do thisn when I heard a song by Forced Entry back in 91. Tempo was like 160 bpm and this guy would hit a three note progression, flutter, hit a a four note progression, flutter, three more notes, flutter. Each flutter was a different note but that whole rif repeated and each time sounded amazingly the same.