Guitar noodling is freestyle playing, basically exploring random notes/chords and relying on trial and error. To noodle, start playing your guitar, randomly, with a ‘I wonder if this will work’ intention (as seen in this video) ~ that’s noodling!
Play on (and noodle on!)…
Marlene
P.S. Bonus, while noodling you may find sounds that you can try in some of your standard songs.