This could refer to blocking in a musical theatre composition. (Blocking is the act of placing and moving performers on stage so that the director achieves the desired look and feel of that scene.)
It would be more helpful if you could show some extra context to your note. You include "..." to which I'm assuming means there is more text.
Ah ha! It's a reference to a B11 Chord. As guitar is not one of my main instruments, I am going to propose a couple ideas. Likely, it means a slide
- while playing the chord, slide your finger on the second fret to the third. It could also mean use fingers 2 and 3 (see this handy B11 Chord reference
). A third possibility is to play the B11 chord using the second and third of the scale - C# and D#, though normally you would say "add 2" if you wanted to add the second, depending on the chord.
If another person who knows guitar better than myself could improve on this answer, I'm all ears. :)