This is, amongst other things, a nice understated ending
chord for the key of G.
Angle your third finger to touch and damp off the open 5th string.
Other fingerings are possible - I've shown the fingering I used to play the example.
In the example I'm playing melody on A minor followed by an arpeggio of the G add 9 chord finishing with a strum.
To play the example—
Hold down open A minor then add your little finger at the third fret 2nd string - pinch this note with open A to start.
Pull off and run down the chord till you get to the slide up -
then use the finger you slid up with ( finger 2 ) to get the note on the 2nd fret 3rd string.
Leave it there and then add the rest of the G add 9 chord.