Slang.
Finding something of value in the street but usually the value (usually in a street's gutter) that typically has no real cash value like finding a whole cigarette lying in the street.
This can also be a reference for those who dumpster dive or dig in the trash.
Usually associated with Crusty Punks and homeless drug addicts.
Example 1:
I can't stand that guy. If he isn't bugging us for something to smoke he digs up cigarette butts from the gutter for something to smoke. I swear he lives on gutter score.
Example 2.
That crusty bum is wandering in the street looking for gutter score again.
Example 3.
Dave is a sick pig. He dug some gutter score out of the trashcan behind the burger joint and happy ate it.
Fondling someone from behind while they are completely oblivious
Damn Jana, stop gutter noodling me I'm watching tv!
"Gutter meth" is really inexpensive methamphetamine.
These guys manufactured gutter meth but have yet to sell it.