#3
You hammer on and pull off between two notes really fast.

See:

Intro to solo in "The God That Failed" - Metallica
The solo of "Killing in the Name of" - RATM
Populus vult decipi. Decipiatur.

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#4
yeah its just going between two notes quickly, over and over is the best way i can describe it... they usually arent more than a whole step apart...

C-C# or C-D
flute players do it a lot.
#5
Jeez thats it! haha wow...i'm retarded.

I've been playing pretty much everyday for almost 5 years now and i'm just realizing thats what it means!
#6
Sounds really cool if you have a whammy bar. Just pull down slowly while trilling the same two notes.

Benny
ಥ_ಥ