What does "trodie" mean?

In "The Star Fraction" by Ken MacLeod, a Scottish science fiction author, a couple walks through a street and past a "trodie". The novel is set in Britain, so it may be a British expression. The street is in a future London.

Full sentence:

"Jordan took her elbow and ostentatiously steered her past the trodie collapsed in the doorway of a Help the Waged charity shop."

Googling the expression didn't help. I can't find any reference to it in Cambridge.

It is the only occurence in the book (Kindle Edition) and after the scene there is no further reference to the word. It's not crucial to the plot, I'm just curious what it means.

Solution 1:

It's a word I made up! It's for someone who habitually electrically stimulates the brain's pleasure centres via an implanted electrode. (Like 'wirehead' in some stories by Larry Niven.)

Solution 2:

It isn't a word in normal use; clearly invented to add some 'local colour' to the book. If I had to guess, I would say that the unconscious down-and-outs in this (Scottish?) street have overdosed not on Special Brew but on electric current passed through their electrodes.

Solution 3:

The sentence is:

Jordan took her elbow and ostentatiously steered her past a trodie who'd collapsed in the doorway of a Help the Waged charity shop.

From the context, my only guess is a word built on the past form (trod) of tread, a person who walked along waiting for charity and just fell here.

Side note: at first I though a letter was missing. "Artrodie" is an old word referring to a type of joint or articulation (in the elbow context).