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    D    Em   Cadd9   C
e|----3----2----0------3-----0-----|
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                         D
When the lonely set in, I fought back the tears
Em                             Cadd9
I don't love you anymore is so hard to hear
G                            D
It felt like a mile from our door to my truck
Em                              Cadd9
Somehow I found the strength to fire it up
G
How lucky am I you said goodbye
D
At seven o'clock on a Friday night


C (hammer 3rd fret of E)
I won't be lonely long
                  G
By the time that first beer is gone
                      D
I'll be floatin' on a neon cloud with my friends around
          G
We'll be raising up our glasses and singing out loud
          Cadd9
To those done me wrong, drinkin' songs
         G               Cadd9
Hey ladies, tonight it's on
     G         D                 Cadd9
No, I won't be lonely long

G          Cadd9 (UDU)

G                             D            Cadd9
Well, I usually ain't much on dancin', but tonight I'm cuttin' up a rug
G                              D             Cadd9
I get to say no ma'am when the ladies ask if I'm with anyone
D
When 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
                  G
By the time that first beer is gone
                        D
I'll be floatin' on a neon cloud with my friends around
          G
We'll be raising up our glasses and singing out loud
                 Cadd9
To those done me wrong, drinkin' songs
          G              Cadd9
Hey ladies, tonight it's on
G              D             Cadd9
No, I won't be lonely long



C D
There ain't an empty space in this parkin' lot
C D
Look at all the friends I got

C (hammer 3rd fret of E)
I won't be lonely long
                 G
By the time that first beer is gone
                         D
I'll be floatin' on a neon cloud with my friends around
         G
We'll be raising up our glasses and singing out loud
                 Cadd9
To those done me wrong, drinkin' songs
         G               Cadd9
Hey ladies, tonight it's on
      G        D             Cadd9        G
No, I won't be lonely long