On some of the G chords he hammers on and off the 2nd fret of the A string.
Also on some of the C chords he hammers on and off the 3rd fret of the low E.

Standard Tuning (EADGBE)

G (320003@1)  D (xx0232@1)  Em (022000@1) Cadd9 (x32030@1) Ce|----3----2----0------3-----0-----| (x32010@1)B|----3----3----0------3-----1-----|
G|----0----2----0------0-----0-----|
D|----0----0----2------2-----2-----|
A|----2----x----2------3-----3-----|
E|----3----x----0------x-----x-----|



G (320003@1)                       DWhen (xx0232@1)the lonely set in, I fought back the tears
Em (022000@1)                      Cadd9I (x32030@1)don't love you anymore is so hard to hear
G (320003@1)                          DIt (xx0232@1)felt like a mile from our door to my truck
Em (022000@1)                            Cadd9Somehow (x32030@1)I found the strength to fire it up
GHow (320003@1)lucky am I you said goodbye
DAt (xx0232@1)seven o'clock on a Friday night

C (hammer 3rd fret of E)
I won't be lonely long
                  GBy (320003@1)the time that first beer is gone
                      DI'll (xx0232@1)be floatin' on a neon cloud with my friends around
          GWe'll (320003@1)be raising up our glasses and singing out loud
          Cadd9To (x32030@1)those done me wrong, drinkin' songs
         G (320003@1)             Cadd9Hey (x32030@1)ladies, tonight it's on
     G (320003@1)      D (xx0232@1)               Cadd9No, (x32030@1)I won't be lonely long

G (320003@1)        Cadd9(UDU) (x32030@1)
G (320003@1)                           D (xx0232@1)          Cadd9Well, (x32030@1)I usually ain't much on dancin', but tonight I'm cuttin' up a rug
G (320003@1)                            D (xx0232@1)           Cadd9I (x32030@1)get to say no ma'am when the ladies ask if I'm with anyone
DWhen (xx0232@1)I'm tippin' the band and buyin' everybody shots
Spendin' every dollar I got

C (hammer 3rd fret of E)
I won't be lonely long
                  GBy (320003@1)the time that first beer is gone
                        DI'll (xx0232@1)be floatin' on a neon cloud with my friends around
          GWe'll (320003@1)be raising up our glasses and singing out loud
                 Cadd9To (x32030@1)those done me wrong, drinkin' songs
          G (320003@1)            Cadd9Hey (x32030@1)ladies, tonight it's on
G (320003@1)            D (xx0232@1)           Cadd9No, (x32030@1)I won't be lonely long



C (x32010@1)name="chord_xx0232@1">D
There ain't an empty space in this parkin' lot
C (x32010@1)name="chord_xx0232@1">D
Look at all the friends I got

C (hammer 3rd fret of E)
I won't be lonely long
                 GBy (320003@1)the time that first beer is gone
                         DI'll (xx0232@1)be floatin' on a neon cloud with my friends around
         GWe'll (320003@1)be raising up our glasses and singing out loud
                 Cadd9To (x32030@1)those done me wrong, drinkin' songs
         G (320003@1)             Cadd9Hey (x32030@1)ladies, tonight it's on
      G (320003@1)      D (xx0232@1)           Cadd9 (x32030@1)      GNo, (320003@1)I won't be lonely long