
1) Casually improvising music 2) Recreational fishing
Found on
https://www.crosswordclues.com/clue/noodling

Noodling is fishing for catfish using only bare hands, practiced primarily in the southern United States. The noodler places his hand inside a discovered catfish hole. Many other names, such as catfisting, grabbling, graveling, hogging, cat-daddling, dogging, gurgling, tickling and stumping, are used in different regions for the same activity. The...
Found on
http://en.wikipedia.org/wiki/Noodling

Pure fret masturbation, often seen as egregious displays of technical prowess. Infamous fret masturbators include: Yngwie Malmsteen, Steve Vai, etc.
Found on
http://www.ourstage.com/blog/2011/9/26/metal-monday-the-somewhat-definitive
No exact match found.