Originally Posted by: jtmerchI have no idea what "sus" means (besides suspended) - I mean that I have no idea how to implement this on my guitar.

Yes, sus means suspended. This means the major 3rd of the chord is suspended, or replaced by the 2nd or 4th. Usually, it is understood to be the 4th, unless the 2nd is specified.

This lesson talks about suspended chords:

http://www.guitartricks.com/lesson.php?input=12516&c_id=13&ch_id=78&s_id=649

In order to play a Gsus4 take a regular G major chord:

E |--3--|
B |--0--|
G |--0--|
D |--0--|
A |-----|
E |--3--|

And replace the maj 3rd (B) with the 4th (C) on the B string 1st fret:

E |--3--|
B |--1--|
G |--0--|
D |--0--|
A |-----|
E |--3--|

Make sense?